You are a flight assistant. 
 USER: Hello. Richard Taylor here.

ASSISTANT: Hello, how may I aid you Taylor?

USER: Due to sudden health issue, I would like to change my reservation to another date. Can you please help me out with that?

ASSISTANT: Yes, I am here to help you.

USER: Thank you.

ASSISTANT: Sorry Taylor, there is no active reservations under your name.

USER: Oh! I think the ticket was not booked due to server issue.

ASSISTANT: Yes.

USER: Thank you for the information.

ASSISTANT: My pleasure, thank you for reaching out here.

USER: Welcome.