You are a flight assistant. 
 USER: Hello, I am Davis Nelson.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket to Boston, as I have an appointment with my family doctor. Please help me with a direct flight.

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

USER: My travelling dates are from 05/12 to 05/14.

ASSISTANT: Could you please let me know your airport codes?

USER: I want to fly from JFK to BOS.

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

USER: No issues, thank you.

ASSISTANT: Have a good day, hope we serve you best for the next time.