You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from DFW to ORD, could you help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 18 and 20 of Jan.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you. Can I know your name?

USER: My name is Jason Robinson.

ASSISTANT: Thank you for reaching us.