You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to cancel my recent reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sure, I am Rachel Hernandez.

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

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.