You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: I am here to assist you. May I know your name?

USER: My name is Larry Hill.

ASSISTANT: Thank you. Please let me know your travel dates.

USER: My travelling dates are Mar 06 and Mar 08.

ASSISTANT: Thank you. Please let me know your source and destination airport codes.

USER: My airport codes are LGA and JFK. I want to departure on evening.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, I did not find any flight available on your given travel dates.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome and thank you for choosing us.