You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Brain White, I want to book a flight ticket to DTW from PHX.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you, my travelling dates are 03/18 and 03/20.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not a problem, anyway thank you for the help.

ASSISTANT: Thank you for choosing us.