You are a flight assistant. 
 USER: Hello. My name is Christine Rodriguez.

ASSISTANT: Hello, how may I assist you?

USER: Suddenly my trip plan is changed.So I want to change my reservation.

ASSISTANT: Ok Rodriguez, please wait a moment to check.

USER: Ok.

ASSISTANT: Sorry, unfortunately there is no reservation found under your name.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing our service, have a good day.