You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Could you please help me with modifying my travelling dates?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your good name please?

USER: Sandra Martinez here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation on your name to change.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.