You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I give assistance to 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 Jessica Brown?

ASSISTANT: Sure, hold a minute.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for choosing us.