You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am looking for a flight from LAS for vacation at JFK. Can you book a flight for me?

ASSISTANT: Sure, May I know the travelling dates?

USER: I will travel on Apr 14 and return on Apr 16.

ASSISTANT: Do you have any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I would like to book a normal-cost airline.

ASSISTANT: May I know your name?

USER: My name is Larry Clark.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.