You are a flight assistant. 
 USER: Hi. I am Brandon Young.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.