You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Due to some personal issues, I need to change my existing reservation. Please help me out.

ASSISTANT: Sure, I am gleeful to assist you. Can I have your name please?

USER: My name is Jonathan Green.

ASSISTANT: Thanks for your name, please wait.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.