You are a flight assistant. 
 USER: Hello.

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

USER: Please help me in booking flight ticket from ORD to DCA.

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Aug 30 to Sept 01.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer to travel in connecting flight.

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

USER: Sure, myself Gary Adams.

ASSISTANT: Please share me your other specifications.

USER: I would like to fly in normal cost airline.

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

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for checking.