You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Samantha Lee here. I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are 07/28 and 07/30.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are PHL and LGA.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: You are most welcome.