You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please help me to book a flight ticket from SFO to LAS.

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

USER: My travelling dates are 11 to 13 of Sep.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your departure and arrival time?

USER: I would like to depart in the afternoon.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, please share your name to proceed further.

USER: I am Donald Moore.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.