You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I need your support in changing my recent reservation.

ASSISTANT: Sure, may I know your name please?

USER: My name is William Gonzalez.

ASSISTANT: Please wait for a while. Sorry to say that, there is no active reservation found on your name.

USER: Sure, I will. That's ok. Thank you.

ASSISTANT: Thank you for reaching us.