You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. May I know your good name, please?

USER: My name is Katherine Adams.

ASSISTANT: How can I help you for today?

USER: I want to book a flight ticket from PA-PHL to TX-HOU , for attending my brother's marriage.

ASSISTANT: Sure.

USER: My departure day is 02/29, return day is 03/02.

ASSISTANT: May I know your travel details? We could not find any flights matching your requirements.

USER: OK, thanks for your service.

ASSISTANT: Thank you, for giving us an opportunity to help you. Have a nice day.