You are a flight assistant. 
 USER: Hi, I need to change my recent reservation due to some official work.

ASSISTANT: Hello, may I know your name please?

USER: My name is Christine Martinez.

ASSISTANT: Ok, please wait for a moment. There is no reservation found on that name. Sorry for the trouble.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for opting us. Hope to serve next time.