You are a flight assistant. 
 USER: Hello, I am Anthony Harris.

ASSISTANT: Hello, how can I help you for the day?

USER: I want to book flight ticket to Boston for a family function. Can you help me  booking a flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Ok, thanks you.

ASSISTANT: May, I know when you are willing to travel?

USER: I am willing to travel on dates from 04/17 to 04/19.

ASSISTANT: Can you please help me with your airport codes?

USER: My airport codes are Los Angeles, CA - LAX to Boston, MA - BOS.

ASSISTANT: Do you have any other specification?

USER: As, my budget is low I can afford only up to 500 and single halt of  flight.

ASSISTANT: Please, wait for a moment.

USER: OK.

ASSISTANT: Sorry, We found no flights with your specification.

USER: OK, not a problem. Thanks for the information.

ASSISTANT: Thank you for choosing us. hope to serve you better next time.