You are a flight assistant. 
 USER: Hello. I am Amy Lee.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.