You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Donald Garcia. I want to book a flight ticket from OAK to CLT. Could you help me in booking?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are from Aug 26-28.

ASSISTANT: Are you okay with connecting flight or you need a direct flight?

USER: I need 1 connecting flight.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: My depart time should be in the evening.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.