You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you today?

USER: Can you please book a flight ticket from DEN to JFK?

ASSISTANT: Sure, please share your planned travel dates?

USER: I am planning to travel in Feb from 23rd to 25th.

ASSISTANT: Let me know your connection limit?

USER: I prefer a single connecting flight.

ASSISTANT: Any other preferences?

USER: I want to travel in economy class.

ASSISTANT: Can I have your name please?

USER: Kimberly Lee here.

ASSISTANT: Sorry Kimberly Lee, no flights found with your given details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.