You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to change my reservation due to sudden health issue, can you please help me out with that?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I have reserved on the name of Patricia Robinson.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for your time. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.