You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to book a flight ticket to LGA from JFK, can you please help me out?

ASSISTANT: Sure, on which dates you are planning to travel?

USER: I would like to fly on Mar 17 and 18.

ASSISTANT: Do you have any airline preference?

USER: Yes, I prefer normal cost airline.

ASSISTANT: May I know your good name?

USER: Sure, my name is Mary Wilson.

ASSISTANT: Sorry Mary, we regret to inform you that there is no flights available as per your request.

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.