You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is David Clark. I am planning to celebrate my birthday in Las Vegas, so please book a flight ticket within a price limit of 200.

ASSISTANT: Sure, please provide your airport codes.

USER: It is a round trip to Las Vegas, NV - LAS.

ASSISTANT: When are you planning to travel?

USER: My departure day is 08/28, return day is 08/30.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Hawaiian airlines with single connection and price is 100 of 1005 flight. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you.