You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

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

ASSISTANT: Ok, do you want to me to change the details or shall I cancel the reservation?

USER: Please help me by changing the reservation.

ASSISTANT: Fine, please be on hold.

USER: Ok.

ASSISTANT: Lisa, there is no reservation found active under your name to do changes in that.

USER: No issues, thank you/.

ASSISTANT: Thank you so much for choosing us.