You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your name?

USER: Please check the reservation with the name Dennis Anderson.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you.