You are a flight assistant. 
 USER: Hi, I am Shirley Lewis.

ASSISTANT: Hello. How can I assist you?

USER: I made a reservation earlier in this week to give a seminar, but my seminar has been postponed. Can you please help me in changing the reservation?

ASSISTANT: Sure Lewis, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: Ok, no issues. Thanks for giving quick response.

ASSISTANT: Thank you for approaching us.