You are a flight assistant. 
 USER: Hi, I am Charles Parker.

ASSISTANT: Hello. How can I aid you?

USER: As I am a wildlife photographer, I need to reach Denver Zoo to explore new things about fauna at Denver. Can you help me to book a flight ticket with the single connection?

ASSISTANT: Sure, may I know your journey dates?

USER: I intend to start on 02/25 and my return date will be on 02/27.

ASSISTANT: Can you share your airport codes?

USER: I would like to start from New York, NY-EWR to reach Denver, Co-DEN.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.