You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Rodriguez.

ASSISTANT: How may 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 it?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our data list.

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

ASSISTANT: Thank you for approaching us.