You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Donna Anderson.

ASSISTANT: How can I help you today?

USER: I would like to change my recent reservation, can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for the quick response.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.