You are a flight assistant. 
 USER: Hello, I am Ryan Martinez.

ASSISTANT: Hello, how can I oblige you?

USER: Can you please assist me in booking a flight ticket to Las Vegas, LAS as I am planning to meet my childhood friends?

ASSISTANT: Sure. May I know your boarding point?

USER: I would like to board from Boston, BOS.

ASSISTANT: Could you please provide your travelling dates?

USER: My preferable dates of journey is 08/12 to 08/14.

ASSISTANT: Do you have any specifications?

USER: Yes, there should be a lay by. Price should not exceed 5000.

ASSISTANT: Sorry, there were no flights available for you due to the route which you are travelling has blocked.

USER: It's ok, no problem.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.