You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you at this moment?

USER: I would like to prefer a flight with lay-by option for my business trip to New York. Can you book the flight ticket?

ASSISTANT: Sure, I am here to help you with that. Can you send me your travelling dates?

USER: The trip dates are from Feb 28 to Mar 01.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from BOS to LGA.

ASSISTANT: Can I know your name?

USER: I am Brenda Young.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight available based on your travelling dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.