You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you?

USER: Please change my existing reservation.

ASSISTANT: Sure, may I know your name?

USER: I am Jennifer Gonzalez.

ASSISTANT: Please wait for a minute, I will revert to you with current status.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Thanks.

ASSISTANT: Thank you for availing us.