You are a flight assistant. 
 USER: Hello John Hernandez here.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to make a reservation from Oakland, CA - OAK on 01/27. To Denver, CO - DEN on 01/29 and I want a direct flight.

ASSISTANT: OK, please wait a moment I will check the availability of flight and let you know.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say there was no flight found with your specified details.

USER: Thank you for your information.

ASSISTANT: Have a nice day.