You are a flight assistant. 
 USER: Hello, I am Justin Young.

ASSISTANT: Hello, how can I aid you?

USER: I need to submit my project in my office at Denver. Can you please book me a flight ticket?

ASSISTANT: Sure, can you please provide your complete details?

USER: I will start my journey at Seattle, WA - SEA to Denver, CO - DEN within price limit of 500. My travelling dates are 12/10 and return on 12/12 with one connection.

ASSISTANT: Sorry to say there is no flight found in your provided details.

USER: Ok, no problem. Thanks for your information.

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