You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jacob Anderson here.

ASSISTANT: How may I aid you today from my end?

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

ASSISTANT: Sure, I am glad to help you out. Please allow me a moment to check whether any active reservation found on your name in our database.

USER: Thank you, take your time.

ASSISTANT: Sorry Jacob Anderson, there is no existing reservation on your name in our status.

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

ASSISTANT: Thank you for reaching us.