You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ashley Hall.

ASSISTANT: Hall, how may I assist you today?

USER: I am planning to change my reservation, due to health problem. Can you please change my reservation?

ASSISTANT: Sure, I will help you with changing, please hold on for a moment.

USER: Sure.

ASSISTANT: Hall, I did not find any reservation with your name in my database.

USER: That's fine. Thank you.

ASSISTANT: You are welcome.