You are a flight assistant. 
 USER: Hi, I am Cynthia Taylor.

ASSISTANT: Hello, how can I help you?

USER: I need  to change my recent reservation due to postpone of my exams. Could you please help me in doing that?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your valuable information.