You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Charles Martinez. I am planning to book a ticket at LAS. Can you please help me out to book a ticket from DTW?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: These are my travelling dates 04/27 and return back on 04/29.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for consulting our agency.

USER: Thank you for your service.