You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to travel Detroit, can you please reserve flight ticket from DEN and DTW?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are May,10 and May,12.

ASSISTANT: May I know your arrival and depart timings?

USER: I am comfortable with any time which is available.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer with one connecting flight and in economy class is required.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Myself Richard Harris.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for opting us.