You are a flight assistant. 
 USER: Hello. I am James Hall.

ASSISTANT: Hello, how may I help you?

USER: I need to visit Charlotte, NC - CLT on 11/13 with my friends. Can you please book a flight ticket under price of 500?

ASSISTANT: Ok, may I know your source and return date?

USER: My origin is BOS. I need to return on 11/15.

ASSISTANT: Sorry, we could not find any flights for you.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.