You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you aid me in booking a flight ticket from PHX to DTW?

ASSISTANT: Sure, can you share your trip dates?

USER: I am planning to start on Apr 12th and return back on Apr 14th.

ASSISTANT: Do you have any preferences?

USER: I prefer to return back in evening time.

ASSISTANT: May I know your name?

USER: I am Daniel Lopez.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.