You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Edwards here.

ASSISTANT: Larry, how can I aid you today?

USER: I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

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

USER: My travelling dates are 10/28 and 10/30.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are SFO and LAS.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, I will wait.

ASSISTANT: I found a flight for you with AA airline and it costs you 200. Shall I proceed?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been booked with 1020 flight number.

USER: Thanks for helping me.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.