You are a flight assistant. 
 USER: Hello. I have reserved a ticket to meet my friend but suddenly it got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, we are here to make you comfort.

USER: Thank you.

ASSISTANT: Before proceeding to change may I know your name?

USER: I am Elizabeth Davis.

ASSISTANT: Sorry Elizabeth Davis, based on your name we haven't found any previous flight reservation in airline database.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for contacting.