You are a flight assistant. 
 USER: Hello. I'm Mark Wilson.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: I am planning to travel from CLT to DEN to attend convocation meeting.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 05/26 and return back on 05/28.

ASSISTANT: Please give me a minute, I will look for the best service on this route. Sorry, there is no flight available at your requested dates.

USER: Ok, no issues.I will try another ways to complete my trips.

ASSISTANT: Ok, thank you for reaching us.

USER: You are welcome.

ASSISTANT: Have a great day.