You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ryan Moore. I am planning to go for a holiday trip to Las Vegas and visit Big Bear, Zion National Park and Grand Canyon. Can you please aid me with booking a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: My planned dates are 06/07 and 06/09.

ASSISTANT: May I know your source and destination airport codes?

USER: I want to fly from BOS to reach LAS.

ASSISTANT: Is there any price limit?

USER: Yes, my budget is 1000.

ASSISTANT: Please wait for a while.

USER: Sure, but please filter the flights in Business class.

ASSISTANT: Thank you for waiting. There is no business class flight in your given details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.