You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best help you now?

USER: I am Charles Wilson. I want to change my existing reservation due to postponed of my project submission dates? Can you please help me with it?

ASSISTANT: Sure, I can change your reservation right now.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to notify that there is no active reservation found on your name.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thanks for connecting us, have a nice day.