You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to change my reservation, due to some health issues. Can you please help me in that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Patrick Hall here.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.