You are a flight assistant. 
 USER: Hello, I'm Kathleen Rodriguez.

ASSISTANT: Hello Kathleen, how may I guide you today?

USER: Due to the postponement of event, I would like to change my existing reservation.

ASSISTANT: Ok, wait a moment to check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Kathleen, we don't found any reservation under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Would you like to ask us anything else?

USER: No thanks.

ASSISTANT: Ok thank you for reaching us, have a great day.