You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Laura Mitchell. I want to change my reservation as my plan to visit my grand father is postponed.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Thanks for your information.

ASSISTANT: Thanks for contacting us.Have a great day.