You are a flight assistant. 
 USER: Hi,. I am Patricia Anderson.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, please wait for couple of minutes.

USER: Sure.

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

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us.