You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Alexander Lopez here. I would like to attend a meeting at Denver, please help me in booking a ticket from JFK to DEN.

ASSISTANT: Sure,I am here to help you.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: I am willing to travel on Sept 02 and return on Sept 04.

ASSISTANT: Do you have any class preference?

USER: Any class is comfortable for my journey.

ASSISTANT: May I know your connection limit?

USER: I need a halt in between my journey.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.