You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed due to the client inconvenience. Change the reservation with the name of Elizabeth Williams, as my reservation was done with this name.

ASSISTANT: Sure, please wait a minute.

USER: Ok, I will wait.

ASSISTANT: There is no reservation found with your name.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for availing us.