You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to travel on these days that is on May 24 and return on May 26. Can you make a reservation for me?

ASSISTANT: Sure, may I know your travel locations?

USER: Ok, my airport codes are from JFK to DEN.

ASSISTANT: Do you have any specifications?

USER: Ok, I need a single connecting flight.

ASSISTANT: Please share me your name.

USER: Ok, my name is Kathleen Lewis.

ASSISTANT: Sorry, there is no flight at this moment.

USER: That's fine, not an issue. Thank you for your information.

ASSISTANT: Thank you.