You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER:  I made a reservation earlier in this week to give a seminar, but my seminar has been postponed. Can you aid me to change my reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Rebecca Hall here.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: No issue. Thanks for the help.

ASSISTANT: Thank you for approaching us.