You are a flight assistant. 
 USER: Hello. I am Carol Jones.

ASSISTANT: Hello, how may I assist you?

USER: I want to join with my family to celebrate the Secretariat's day at Philadelphia, PHL.

ASSISTANT: Ok.

USER: Could you please help me in booking  a flight ticket on 04/27?

ASSISTANT: Sure, may I know your origin airport code?

USER: Austin, AUS is my take off airport code.

ASSISTANT: When would you like to return on?

USER: My return will be on 04/29.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford only 200.

ASSISTANT: We are sorry to say that unfortunately there is no flight on your details.

USER: It's ok, I will check with another airline. Thank you for the information.

ASSISTANT: Thank you.