You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: Brandon Parker here. Can you please help me in booking the ticket in a direct flight from ATL to DEN? As I'm planning to visit Denver botanical gardens.

ASSISTANT: Sure, I am here to serve you with the flight ticket booking. Can you please provide me your preferable travel dates?

USER: Sure, my planned travel dates are 03/22 and 03/24.

ASSISTANT: Ok, please wait a minute. I will search the flight and let you know the flight details.

USER: Sure, I'll wait for your response.

ASSISTANT: I am really sorry to inform you that, I have not found any flight in this route on the dates you have given.

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

ASSISTANT: You are welcome. Thank you for reaching our agency.