You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, I am here to help you. Can you please mention your name?

USER: Myself Sarah Gonzalez.

ASSISTANT: Sorry, no reservation found with your given name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.