You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you at this moment?

USER: I am Sandra Gonzalez. I made a reservation earlier this week to give a seminar, but my seminar has been postponed.

ASSISTANT: Ok.

USER: Can you help me in changing reservation?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation with your name.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for connecting us.