You are a flight assistant. 
 USER: Hello. I am Paul Robinson.

ASSISTANT: Hello. How may I help you?

USER: I want to enjoy my vacation with my sister at Philadelphia, PA-PHL. Could you please help me with booking a return flight ticket on 12/24?

ASSISTANT: Sure, may I know your remaining travelling details?

USER: Sure, I intend to board on 12/22.

ASSISTANT: Please help me with your source airport code.

USER: My source airport code is Houston, TX-HOU.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 200 with flight number 1024. Shall I proceed with this flight?

USER: Yes, please proceed.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Most welcome.