You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I have to go to Orlando, FL-MCO to attend my friend's birth day.

ASSISTANT: Ok.

USER: So, I need your help in booking a ticket.

ASSISTANT: Will you please tell me your journey details?

USER: I need to start from Denver, CO-DEN on 07/15 and I should catch my return flight on 07/17.

ASSISTANT: Sure, please wait a while. I will let you know the details.

USER: Ok.

ASSISTANT: Thanks for waiting. May  I know your name to know the further details?

USER: I am Charles Johnson.

ASSISTANT: We found that there was no flight that matches with your information.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.