You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I'm planning to visit Denver botanical gardens, can you please book a ticket from PHX to DEN?

ASSISTANT: Sure, may I know your dates of travel?

USER: Sure, my planned departure and return travel dates are 27th and 29th of December.

ASSISTANT: Do you have any specifications?

USER: Yes, I prefer business class ticket.

ASSISTANT: Ok, please wait a minute.

USER: Sure, make sure that my maximum connection has to be 1.

ASSISTANT: Sorry, there were no flights found on your route.

USER: That's ok, thank you for giving the information.

ASSISTANT: May I know your name?

USER: Yes, my name is Jeffrey Lopez.

ASSISTANT: Thank you.