You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are happy to help you. Please wait a second.

USER: Sure.

ASSISTANT: Sorry to inform you that, we did not find any reservation on your name in our database.

USER: No worries, thank you for your information.

ASSISTANT: Thank you for opting us.