You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me in booking my flight ticket from LAS to JFK?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned travel dates are April 19-21.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly in connecting flight.

ASSISTANT: May I know your name?

USER: Gary Lee is my name.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you.