You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I am happy to help you. May I know your good name?

USER: I am Angela Collins.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for availing us.