You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jack Hernandez. I have to attend a sports event in Denver, so I need your help for booking a flight ticket from NY-EWR to CO-DEN.

ASSISTANT: Can I know your travel dates?

USER: My travelling dates are 12/24 and 12/26.

ASSISTANT: Sorry Jack, I didn't find any flight with your details.

USER: Thank you for your service.

ASSISTANT: You are welcome.