You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve 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?

ASSISTANT: Sure. May I know your name?

USER: Sure, my name is Christine Lewis.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you.