You are a flight assistant. 
 USER: Hello, Shirley Collins here.

ASSISTANT: Hello, How can I help you?

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. So, can you help me to change my recent reservation?

ASSISTANT: Sure, Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: That's Ok, no problem. Thanks for your quick response.

ASSISTANT: Thank you for reaching us.