You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ronald Parker. I would like to change my existing reservation, as my exams have postponed suddenly. Can you help me with this?

ASSISTANT: Sure, wait for a minute. Sorry Parker, no reservation found on your name.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for approaching us.