You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation due to my health issues, can you please help me with this?

ASSISTANT: Sure, we are happy to help you. Can I have your good name to proceed further?

USER: My name is Susan Clark.

ASSISTANT: Sorry, we did not find any active reservation on your name in our data.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for reaching us.