You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

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

USER: Sure, my planned departure and return travel dates are 11th and 13th of June.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer single connected flight to travel.

ASSISTANT: May I know your name for the booking?

USER: My name is Raymond Green.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: Sorry, no flights are available on your required dates.

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

ASSISTANT: Welcome, thank you for reaching us.