You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory King.

ASSISTANT: How can I assist you today?

USER: I planned to attend for a wedding in IAH, can you please help me to book a flight ticket from DTW?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: I prefer to travel on 05/26 and 05/28.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: I'm sorry to inform you that there are no flights available for you on those dates.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.