You are a flight assistant. 
 USER: Hello. I am Rachel Wilson.

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend a earth and nature festival at Denver, help me in booking my flight ticket with one connection limit.

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling days are from 02/18 to 02/20.

ASSISTANT: May I know your airport codes?

USER: My airport abbreviates are from CA-SFO to CO-DEN.

ASSISTANT: Sorry to inform that no flights found with your specified details.

USER: No issues. Thank you for your response.

ASSISTANT: Thank you for choosing us.