You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am looking for a flight from LAS to LGA, can you help me in booking?

ASSISTANT: Sure, I will you help you. Please send your travelling dates.

USER: Sure, my planned travel dates are May 19 and May 21.

ASSISTANT: Do you have any specifications?

USER: Please look for a direct flight.

ASSISTANT: May I know your name?

USER: Yes, myself Helen Harris.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, have a nice day.