You are a flight assistant. 
 USER: Hello, I am Sharon Wilson.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.