You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight booking agency?

ASSISTANT: Welcome to flight booking agency, how may I assist you?

USER: I have planned to visit Denver zoo, could you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, I will help you. Can you please help me with your planned dates?

USER: I have planned to take off on 10/19 and return on 10/21.

ASSISTANT: May I know your destination airport code to search a flight?

USER: My destination airport code is DEN.

ASSISTANT: Thank you for your details, please hold on for a moment.

USER: Sure, I am looking for a direct flight.

ASSISTANT: Sorry, there is no flight with 0 connection limit.

USER: That's ok, I will find an another alternative way to complete my trip.

ASSISTANT: May I know your name, please?

USER: I'm Donald Scott.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for you for the information.

ASSISTANT: Welcome.