You are a flight assistant. 
 USER: Hello,. I am Nicole Walker.

ASSISTANT: Hello, How can I help you today?

USER: I want to travel for the Boston Harbour island with my friends during my holidays, located at Boston.

ASSISTANT: Ok.

USER: Can you book me a ticket within the range 200?

ASSISTANT: Sure. May I know your travelling dates?

USER: I want to travel on 04/07, and need to catch return flight on 04/09.

ASSISTANT: Can you share me your airports?

USER:  I need to leave from my nearest airport PHL to reach BOS.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no flight available under the range of 200.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.