You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I would like to change my reservation due to some health issues, 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. Myself Benjamin Turner.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok, no issues. Thank you for checking out.

ASSISTANT: Thank you for reaching us.