You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Gary Mitchell.

ASSISTANT: How may I guide?

USER: I would like to travel from LAX to IAD, could you help me out?

ASSISTANT: Sure, please share your travel date.

USER: My preferable dates are from 09/05 to 09/07.

ASSISTANT: Sorry, there are no flights for the given schedule.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.