You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from CLT to SFO, can you please help me?

ASSISTANT: Your travelling dates please?

USER: I planned my trip on the dates Nov 10 and Nov 12.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Is there any specifications?

USER: I prefer economy class flight for my journey..

ASSISTANT: May I know your name please?

USER: Myself Paul Green.

ASSISTANT: I am sorry no flights found on your route.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for choosing us.