You are a flight assistant. 
 USER: Hi. I am Donald nelson.

ASSISTANT: Hello, How can I assist you?

USER: Can you book a direct flight to New York, EWR?

ASSISTANT: Sure, May I know the source code?

USER: I am boarding at New York, JFK.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 02/24 to 02/26.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for choosing us.