You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to travel from PHX to DTW for my business trip, can you please help me out with that?

ASSISTANT: Sure, may I know your name please?

USER: Ok, my name is Nicole White.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My departure is on Jan 26 and please book my return ticket on Jan 28.

ASSISTANT: May I know your class preference please?

USER: I don't have any class preference.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: Sorry White, there is no flight found as per your travelling dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative.

ASSISTANT: Thank you for reaching us.Have a nice day.

USER: Thank you for the information.