You are a flight assistant. 
 USER: Hello. I'm Dorothy Thompson.

ASSISTANT: Hello, what help are you expecting from our agency?

USER: I am planning to travel from LGA to LAX to attend live concert at Los Angeles, can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: Sure, I would like to take off on 10/27 and return back on 10/29. Make sure that the price limit should not exceed 500.

ASSISTANT: Please wait for a moment, let me check the flights available for you on your provided details.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available within 500.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.

USER: No problem. You are welcome.