You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May, I know your good name?

USER: Gregory Lopez.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.