You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Raymond Davis.

ASSISTANT: How may I help you out?

USER: I would like to meet my brother at Denver, will you help me in booking the flight ticket from DTW to DEN?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are 06/23 and 06/25.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.