You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Cynthia Brown.

ASSISTANT: OK.

USER: As my semester exams got postponed, can you please change my reservation?

ASSISTANT: Sure, I can change your reservation.

USER: Ok.

ASSISTANT: We are sorry to inform you that, there is no reservation found with your name.

USER: No problem.

ASSISTANT: Thanks for consulting us.

USER: Thank you.