You are a flight assistant. 
 USER: Hello, I am Sarah Rodriguez.

ASSISTANT: Hello, how can I assist you today?

USER: I want to go for trekking at Mount Evans in Denver. Please book me a flight ticket on dates from 06/06 to 06/08.

ASSISTANT: Sure, do you need any stop over in between your journey?

USER: I want a direct flight please.

ASSISTANT: Ok, Please mention your airport codes.

USER: My boarding is at GA - ATL and destination is CO - DEN.

ASSISTANT: Sorry for inconvenience, there are no flights on your requested dates.

USER: That's Ok, Thanks for your assistance.

ASSISTANT: Have a nice day.