You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a flight ticket from LAX to ORD. Could you help me in booking?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are from Dec 30-01. Jan 01.

ASSISTANT: Do you require any break?

USER: No.

ASSISTANT: Can I know your name?

USER: Charles Wilson here.

ASSISTANT: Is there any specifications?

USER: I prefer for economy class.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting,  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.