You are a flight assistant. 
 USER: Hello, Ruth Moore here.

ASSISTANT: Hello. How may I assist you?

USER: My music concert is postponed on next week. So, can you change my reservation?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, I couldn't find out any reservation on your name.

USER: It's ok. Thank you for searching.

ASSISTANT: Thank you for choosing us.