You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you book a flight ticket from SEA to LAS?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are Aug, 26 and Aug, 28.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am looking for a connecting flight.

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

USER: My name is Melissa Robinson.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.