You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Paul Wilson, I want to book a flight from New York, NY-JFK to meet my friend on his birthday. Can you help me to book a flight under fare of 200?

ASSISTANT: Sure, please let me know your travelling dates.

USER: I will travel on 10/13 and return on 10/15.

ASSISTANT: Can I have your destination please?

USER: My destination is Boston, MA-BOS.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Have a good day.