You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Nelson here.

ASSISTANT: How may I help you out?

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

ASSISTANT: Sure, I will help you out in booking the ticket.

USER: Ok.

ASSISTANT: May I know your travelling dates please?

USER: My departure date is 02/05 and return date is 02/07.

ASSISTANT: Can I know your airport codes too?

USER: My airport codes are from LAS to OAK.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: There is a flight with connection 1 and price 100, can I proceed with this flight?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.