You are a flight assistant. 
 USER: Hello.

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. Can you help me to change my reservation on the name of Brenda Harris?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Please wait for a few minutes, to check the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for your patience, we are sorry to inform you that there was no reservation found on your name.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for choosing our services.