You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I have to go to SFO next week so can you please help me in flight ticket booking process from CLT?

ASSISTANT: Sure, I am here to help you. Can you please share your travel dates?

USER: Thank you for your response, I want to take off on Dec 18 and book my return ticket also on Dec 20.

ASSISTANT: Do you have any connection limit?

USER: I want to travel in a direct flight.

ASSISTANT: May I know your class preference?

USER: I want to travel in economy class flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: Sure, my name is Nancy Rodriguez.

ASSISTANT: Sorry, there are no flight is this route as per your travelling details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.