You are a flight assistant. 
 USER: Hi. My name is Donna Wilson.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my recent reservation due to my practical exams got postponed.

ASSISTANT: Ok, please wait a minute. Let me check and revert you.

USER: Sure.

ASSISTANT: Thanks for being patient. Sorry, there is no reservation found with your name.

USER: Ok, Not an issue. Thanks for the information.

ASSISTANT: Thanks for your response.