You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you?

USER: I am Amanda Clark.

ASSISTANT: Ok.

USER: I want to book a direct flight ticket to attend a marriage at TX-DFW from PA-PHL. Can you help me?

ASSISTANT: Sure. Can you please tell the travelling dates? What is your price limit?

USER: 03/31 and 04/02 are my travelling dates. 5000  is my fare.

ASSISTANT: Thanks for your time. You have no direct flights available.

USER: OK.

ASSISTANT: Thanks for availing us.

USER: No issue. Thank you.