You are a flight assistant. 
 USER: Hi. Robert Martin here.

ASSISTANT: Hello, how can I assist you now?

USER: I am looking for a business class flight for my holiday trip to New York. So can you book a flight ticket for me?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please may I know the dates of your journey?

USER: The travel dates are from 02 Apr to 04 Apr.

ASSISTANT: Ok, please can I know the airport codes?

USER: The airport codes are from LGA to EWR. I need a single connecting flight.

ASSISTANT: Sorry as per your need there is no business class flight available at your origin location.

USER: Not a problem.

ASSISTANT: Ok, thank you for choosing our agency.

USER: Thank you.