You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, can I know your name?

USER: Myself Samantha Lewis.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching our service.