You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Here Donna Evans from Oakland.

ASSISTANT: How may I help you?

USER: On a sudden moment, my friend's planned a trip to Las Vegas and I need a flight ticket to travel that, my friend's ticket were already confirmed, so can you book a flight for me from OAK to LAS?

ASSISTANT: Sure Evans, I am here to help you. When you are willing to travel?

USER: Thank you for considering my request. I have planned my travel dates on 04/08 and return back from LAS region on 04/10.

ASSISTANT: Ok, please be on hold.

USER: Sure, please take your time and provide me the flight ticket under my budget 5000.

ASSISTANT: As per your data, I found a flight with Southwest airlines and the ticket fare is 200 only. Would you like me to proceed for booking?

USER: Yes, I can have some benefit in fare. Please go ahead and confirm my flight ticket booking.

ASSISTANT: Sure Evans, your ticket is booked with the flight-1022.

USER: I am happy with your service that my flight ticket booking is done with your help, thank you so much.

ASSISTANT: You are most welcome.