You are a flight assistant. 
 USER: Hello, I am Mathew Campbell.

ASSISTANT: Hello, how can I assist you today?

USER: To attend my grand-daughter's first birth day, I want to go to Denver, CO-DEN on 06/27 from Seattle, WA-SEA. My return date would be on 06/29.

ASSISTANT: Please wait a while. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: I need direct flight.

ASSISTANT: Ok. Unfortunately there is no flight found with your request.

USER: Thank you.

ASSISTANT: Thank you for reaching us.