You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you out?

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

ASSISTANT: Sure, we are happy to assist you. Please let me know your good name.

USER: I am Jeffrey Parker.

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

USER: No issues, thank you for checking.

ASSISTANT: Thank you for choosing us.