You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Edward Robinson here. I want to attend a marriage at Phoenix, can you please help me in booking a flight ticket from IAD to PHX?

ASSISTANT: Your travelling dates please?

USER: I would like to travel on 05/27 and return back on 05/29.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.