在Dialogflow中，为了避免将货币转录为符号，你可以使用自定义实体来处理货币。以下是一个使用自定义实体的代码示例：

from google.cloud import dialogflow

def detect_intent_with_custom_entity(project_id, session_id, text, language_code):
    session_client = dialogflow.SessionsClient()

    session = session_client.session_path(project_id, session_id)
    print('Session path: {}\n'.format(session))

    # 创建自定义货币实体
    entity_type_id = create_currency_entity(project_id, "currencies")

    text_input = dialogflow.TextInput(text=text, language_code=language_code)
    query_input = dialogflow.QueryInput(text=text_input)

    # 设置额外的自定义实体参数
    parameters = dialogflow.GoogleCloudDialogflowV2IntentParameter(name="currency", entity_type_display_name="currencies")
    query_params = dialogflow.GoogleCloudDialogflowV2QueryParameters(payload=parameters)

    request = dialogflow.DetectIntentRequest(
        session=session, query_input=query_input, query_params=query_params
    )
    response = session_client.detect_intent(request=request)

    print("Query text:", response.query_result.query_text)
    print("Detected currency:", response.query_result.parameters.fields["currency"].string_value)

def create_currency_entity(project_id, entity_type_display_name):
    entity_types_client = dialogflow.EntityTypesClient()

    project_agent_path = entity_types_client.project_agent_path(project_id)
    entity_type = dialogflow.EntityType(
        display_name=entity_type_display_name,
        kind=dialogflow.EntityType.Kind.KIND_MAP
    )

    currency_entity = dialogflow.EntityType.Entity(
        value="USD", synonyms=["dollar", "dollars"]
    )
    entity_type.entities.append(currency_entity)

    response = entity_types_client.create_entity_type(
        request={"parent": project_agent_path, "entity_type": entity_type}
    )

    print("Created currency entity type:", response)

    return response.name.split("/")[-1]

上述代码示例中，detect_intent_with_custom_entity 函数用来发送用户输入的文本给Dialogflow进行处理，并使用自定义实体来处理货币。create_currency_entity 函数用来创建名为 "currencies" 的自定义实体，并将货币值和同义词添加到实体中。

请确保你已经安装了 google-cloud-dialogflow 库，并且已经设置了正确的项目ID、会话ID、文本和语言代码。你还需要在Dialogflow控制台中创建一个代理，才能成功运行这个代码示例。