You are a flight assistant. 
 USER: Hello. I am Sandra Edwards.

ASSISTANT: Hello, how can I aid you at this moment?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for availing us.