You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I would like to travel with my friends, can you please help me to book a ticket from TX-HOU on 08/02?

ASSISTANT: Sure, could I know your destination airport code and return date please?

USER: Sure, my destination airport code is DC-DCA and my return date is 08/04.

ASSISTANT: May I know your name please?

USER: Sure, my name is Robert Evans.

ASSISTANT: Sorry Robert, I have not found any flight for you as per your details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Welcome.