You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of service your looking for?

USER: Can you please reserve me a flight ticket from LAS to DFW?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are 01/13 - 01/15.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a single connection.

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

USER: Richard Mitchell.

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 opting us.