You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Jerry Mitchell. I am looking for a flight from DFW to OAK, can you help me in booking the flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are from 02/19 till 02/21.

ASSISTANT: As per your intent, there are no flights available.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.