You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Jennifer Lopez. I am planning to book a ticket from CLT to LAX. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I am planning to travel on Dec 27 and return back on Dec 29.

ASSISTANT: Do you have any class or time preferences?

USER: No, my return time is afternoon.

ASSISTANT: Do you have any connection or airline preferences?

USER: I am looking for a connecting flight.

ASSISTANT: Sorry, there is no flight available on your travelling dates.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome, have a nice day.