You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Jacob Thomas. I am planning to visit San Francisco, will you help me in booking the flight ticket from LAS to SFO?

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

USER: My preferable journey dates are Jan 19 and Jan 21.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: May I know your departure and arrival time?

USER: My return time must be in evening.

ASSISTANT: Do you have any other requirements?

USER: No, thank you for asking.

ASSISTANT: Ok, please be on hold.

USER: Ok, I will wait for you response.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.