You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

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 will help you in changing the ticket. May I know your name please?

USER: Thank you for taking my request into consideration. I have reserved it on the name of Richard Jackson.

ASSISTANT: Sorry, there are no reservations found.

USER: Oh! I think the ticket was not booked properly, thank you for checking anyways.

ASSISTANT: Thank you for reaching us.

USER: Welcome.