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

ASSISTANT: Hello, how may I help you?

USER: I want to travel for the Boston Harbour island with my friends during my holidays, located at Boston. Can you book me a ticket within the range 500?

ASSISTANT: Ok. Sure, may I know your journey dates?

USER: I want to travel on 03/20, and need to catch return flight on 03/22.

ASSISTANT: Kindly, share your airport codes.

USER: I want to fly from LGA to BOS.

ASSISTANT: Please hold on.

USER: Sure.

ASSISTANT: No flights found on your journey locations.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thanks for the information.