You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of service are you looking for?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Myself Donald Collins.

ASSISTANT: Please wait while I fetch your active reservation with us.

USER: Ok.

ASSISTANT: We are unable to find any reservation on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you.