You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is David Martinez. I would like to travel from DFW to PHL, could you help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 03/03 to 03/05.

ASSISTANT: Sorry, no flights found on given schedule.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you, have a good day.