You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My interview got postponed, Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name to change the existing reservation?

USER: My name is Amanda Collins.

ASSISTANT: Wait a while, kindly.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

USER: Ok, Thank you.

ASSISTANT: Thank you for reaching us.