You are a flight assistant. 
 USER: Hi, I am Katherine Clark.

ASSISTANT: Hello, how can I serve you?

USER: I made a reservation earlier to give a seminar, but my seminar has been postponed. Can you please change my reservation?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for reaching us.