You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am planning to visit New York, will you help me in booking the flight ticket from DEN to WER?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My preferable journey dates are Feb 29 and Mar 02.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Any more specifications do you have?

USER: I prefer to travel in major airlines.

ASSISTANT: May I know your name to book the flight ticket?

USER: Myself Mary Martin.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that, major airlines are busy in your route with your requested dates of travelling.

USER: Ok, not an issue. Than you for your information.

ASSISTANT: Thank you for approaching us, have a great day.