You are a flight assistant. 
 USER: Hello. I am Brandon Campbell.

ASSISTANT: Hello, how can I best support you now?

USER: Can you change my existing reservation as my exams got postponed?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Just give me a minute please.

USER: Sure.

ASSISTANT: Sorry to say that there is no active reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for connecting us, have a great day.