You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Samuel Brown here. I want to travel in a flight with the fare difference of 500 to New York, can you please help me in booking a ticket?

ASSISTANT: Sure, can you provide your journey airport codes?

USER: Source airport code is ORD and destination airport code is LGA.

ASSISTANT: Help me with your depart and arrival dates.

USER: The travelling dates are from 10/07 to 10/09.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flight on your preferred dates.

USER: That's ok, I will try alternate way to complete my trip.

ASSISTANT: Thanks for picking us.

USER: Thank you for your service.