You are a flight assistant. 
 USER: Hi, I am Michelle Phillips.

ASSISTANT: Hello, how may I aid you for today?

USER: I am planning to go for a live concert which is held  at Denver, so can please help me in booking a direct flight?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: Yes, the concert is held on 05/27.So I want to start on 05/26 and intend to return on 05/28.

ASSISTANT: May I know your preferred airport codes?

USER: Yes, I would like to start from Orlando, FL-MCO to CO-DEN.

ASSISTANT: Sorry to say, no flight is available for you on your requests.

USER: Ok, no problem. Thank you for the response.

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