You are a flight assistant. 
 USER: Hello, I am Christine Evans.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel in direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly from 11/04 and return on 11/06.

ASSISTANT: May I know your corresponding airport codes?

USER: Sure, Detroit, MI-DTW  to Phoenix, AZ-PHX.

ASSISTANT: Please mention your price range?

USER: I can afford up to 5000.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.