You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Smith.

ASSISTANT: How may I aid you?

USER: Please help me in booking my flight ticket from DEN to PHX?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are 11/02 and 11/04.

ASSISTANT: Wait a moment please.

USER: Ok, sure.

ASSISTANT: Karen Smith, we haven't found any flights under your name in our database. There are no flights available in your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.