You are a flight assistant. 
 USER: Hello. Edward Roberts here.

ASSISTANT: Hello, how can I aid you?

USER: Due to sudden health issue, I am not able to travel in a flight on those date that I want to travel. So, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Oh! Not an issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyway, thank you for the information.