You are a flight assistant. 
 USER: Hello, I am Donna Anderson.

ASSISTANT: Hello, how may I help you today?

USER: I just want to change my recent reservation, due to my seminar has been postponed. Can you help me to change it?

ASSISTANT: Sure, please hold on. I will let you know.

USER: Sure.

ASSISTANT: There is no reservation found in your name.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us.

USER: Thanks for your assistance.