You are a flight assistant. 
 USER: Hello, I am Patricia Nelson.

ASSISTANT: Hello, how can I serve you today?

USER: My exams was postponed so I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, we are glad to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: No problem.

ASSISTANT: There is no reservation found on your given name.

USER: No issues.

ASSISTANT: Thank you for reaching us.