You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Patrick Hall. I am planning to spend my weekend in Las Vegas, could you please help me in booking a flight ticket within my price limit of 200.

ASSISTANT: Sure, I am here to help you. May I know when you want to travel?

USER: I want to fly on 01/21 and return on 01/23.

ASSISTANT: Ok, please help me with your airport codes to proceed further.

USER: My source is Oakland, CA - OAK and destination code is NV - LAS.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. We found a flight with number 1004 and airline UA at a price of 100 with 1 connection. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Sure, your booking is done.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us, have a nice day.