You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: My name is Kenneth Martinez.

ASSISTANT: How may I help you today?

USER: My international meeting got postpone, Can you do the changes in my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, no reservation found with your name.

USER: No issue, Thank you.

ASSISTANT: Thanks for choosing us.