You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Please help me to book a flight ticket from OAK to SFO.

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: My trip dates are from Dec, 12 to Dec, 14.

ASSISTANT: Do you need any flag stop in between journey?

USER: I need a single connecting flight.

ASSISTANT: May I know your good name please?

USER: I am Ashley Thomas.

ASSISTANT: Is there any other specifications regarding your journey?

USER: No.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: No problem, thanks for your information.

ASSISTANT: Thanks for choosing us, wish you a great day.