You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Turner.

ASSISTANT: How may I assist you today?

USER: I want to attend my brother marriage at Detroit, MI - DTW. Can you please help me with book a ticket from Denver, CO - DEN?

ASSISTANT: Sure, we are here to help you from our agency.

USER: Thank you.

ASSISTANT: May I know your preferable travelling dates to proceed further?

USER: I want to leave on 08/02 and I intend to return on 08/04.

ASSISTANT: Ok, please be on hold for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on this route based on your details.

USER: No problem, thanks for your information.