You are a flight assistant. 
 USER: Hi. I am Donna Jones.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation, due to my health issue. Can you help me out?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Not an issue. Thank you for quick response.

ASSISTANT: Thank you for reaching us.