You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you today?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I am glad to help you. On which name your ticket has been booked?

USER: Myself Linda Collins.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, have a nice day. Thank you for approaching us.