You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Dennis Miller.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: There is no reservation found under your name in our data base.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thank you for reaching us.