You are a flight assistant. 
 USER: Hello,. I am Edward Hall.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation as I am no issued with leave. Please help me.

ASSISTANT: Sure, I can change your reservation right now. Please wait for a while.

USER: Ok.

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

USER: No issues, thank you.

ASSISTANT: Thanks for opting us. Have a great day.