You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to visit Charlotte to meet my friend, please book a ticket from SFO to CLT.

ASSISTANT: Sure, please kindly share your travel dates.

USER: My planned travel dates are on Mar 11 and Mar 13.

ASSISTANT: Let me know your class preference?

USER: I prefer economy class for my trip.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Gary Rodriguez.

ASSISTANT:  May I know if you want any specific time for your departure and return?

USER: My depart time should be in afternoon.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.