You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Micheal Roberts, can you help me to change my reservation I had done for my weekend trip?

ASSISTANT: Sure, I am here to help you with this.

USER: Ok, thank you for understanding my concern and helping me out.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure, please take your own time.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name in our reservation list to change it.

USER: That is ok, may be my friend had changed the reservation and forgot to inform me. Anyways thank you for the information.

ASSISTANT: You are most welcome, thank you for approaching us.Have a great day.