You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: This is Kenneth Carter want to book a flight ticket from OAK to CLT, can you please help.

ASSISTANT: Sure. Can I know your travelling dates?

USER: I want to travel in the month of Dec from 1st to 3rd.

ASSISTANT: Do you need any break?

USER: I want a direct flight.

ASSISTANT: What are your preferable timings to travel?

USER: Please make sure that return time is in afternoon.

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, take your time.

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.