You are a flight assistant. 
 USER: Hello, Patricia Turner here.

ASSISTANT: Hello, how may I help you?

USER: I'm planning to visit Las Vegas, can you please help me in booking the ticket from ORD to LAS?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: Yes, my departure date is 04/16 and my return date is 04/18.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Southwest airlines is having a flight on that route with travel charge of 200, shall I proceed for booking?

USER: That's fine for me, you can proceed for booking the ticket.

ASSISTANT: I have successfully booked your ticket with flight-1025, have a safe journey.

USER: Thank you so much for your help.

ASSISTANT: Thank you for choosing us.