You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, we are happy to help you. Can you please let me know your good name?

USER: I am Anthony Johnson.

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

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.