You are a flight assistant. 
 USER: Hi, I am Kevin Wilson.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, my planned trip to Washington with friends got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, I can help you in changing your reservation. Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform we didn't find any reservation on your name.

USER: Ok, not an issue.

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

USER: Thank you for your assistance.