You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Donna Walker, can you help me to amend my reservation which I did recently?

ASSISTANT: Sure, I am here to help. Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry Donna, there is no reservation on your name in our database.

USER: That's ok, thank you for aiding me.

ASSISTANT: Thank you for contacting us.