You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Brian Baker.

ASSISTANT: How may I help you today Baker?

USER: Can you please book a flight ticket from DTW on 07/28 date?

ASSISTANT: Ok, provide return journey date if you have along with destination.

USER: Sure, please book a return ticket on 07/30 date from HOU location.

ASSISTANT: Ok, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight for you on your preferable dates.

USER: It's ok, no problem. Anyway, thank you for the information.

ASSISTANT: Welcome, have a good day.