You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is William Baker. I would like to travel from ATL to IAD, could you help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My preferable dates are from 01/04 to 01/06.

ASSISTANT: Sorry Baker, no flights in your trip.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.