You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to NFC agency. How can I help you?

USER: Actually I had a business meeting in DTW,  but my manager had changed the dates of the meeting. So I need to modify my existing reservation, can you help me?

ASSISTANT: Sure, could you provide me your name?

USER: My previous reservation is done with the name Jerry Gonzalez.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry Jerry, no reservation found on your name.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for approaching us.