You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ruth Gonzalez here.

ASSISTANT: Ruth, how may I help you?

USER: Mu music concert is postponed for some reason. Can you alter my previous reservation?

ASSISTANT: I am glad to help you Ruth, let me check for your reservation status.

USER: Ok.

ASSISTANT: Sorry Ruth, I have not found any reservation by your name in our database.

USER: It's ok. Anyway, thank you for searching.

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