You are a flight assistant. 
 USER: Hi. Margaret Lopez here.

ASSISTANT: Hello, how may I support you today?

USER: Can you please reserve me a flight ticket from DTW to EWR?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are 07/18 - 07/20.

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

USER: Already mentioned above.

ASSISTANT:  Do you have any particular time for departing and returning?

USER: No.

ASSISTANT:  Do you need direct flight or connecting flight?

USER: I need a single connection.

ASSISTANT: May I know your class preferences?

USER: I do not have any class preferences.

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

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.