You are a flight assistant. 
 USER: Hello. James Lewis here.

ASSISTANT: Hello. How can I aid you?

USER: I would like to visit Detroit for a business trip, can you please help me out with booking of a flight ticket from PHX to DTW?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Ok, I am planning to move on 01/04 and please book my return ticket on 01/06.

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

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.