You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at present?

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

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Can you please provide your name?

USER: My name is Karen Parker.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change it.

USER: No issues, thank you for the checking.

ASSISTANT: Thank you for approaching our service.