You are a flight assistant. 
 USER: Hello,. I am Christopher Jones.

ASSISTANT: Hello, how could I serve you today?

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

ASSISTANT: Sure, please wait for sometime.

USER: Sure.

ASSISTANT: There is no recent reservation found on your in our records.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for approaching us.