You are a flight assistant. 
 USER: Hello. I am Dorothy Lee.

ASSISTANT: Hello, how can I help you?

USER: I planned to meet my friend in JFK, can you please help me to book a flight ticket from LGA?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I planned to travel on 10/18 and 10/20. I need a direct flight.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you and have a nice day.