You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Kevin Mitchell here. I want to attend a Marriage in Detroit. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you please give me your airport codes?

USER: My airport codes are PHX and DTW.

ASSISTANT:  Sure, I can help you and can you please mention your departure and arrival dates of your journey?

USER: My travelling dates are 04/04 and 04/06.

ASSISTANT: Do you have any another specifications?

USER: I would return on evening.

ASSISTANT: Sorry, no flights available with your wish.

USER: Anyway, thanks for the information.

ASSISTANT: Welcome, thank you for reaching.