You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: I made a earlier reservation to attend a conference, due to some problems it got postponed. Can you please change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Kindly mention your name to check the previous reservation status.

USER: Sure, please check with the name of Lisa Martin.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name in the database.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us, have a good day.