You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: My name is Brenda Thomas. I would like to change an existing reservation.

ASSISTANT: Sure, I would be happy to help you with that.

USER: Alright.

ASSISTANT: May I know your name please to proceed further?

USER: Brenda Thomas.

ASSISTANT: Please wait for a minute.

USER: Sure,.

ASSISTANT: I am sorry to inform that there is no reservation found under your name.

USER: No issue, Thank you for the information.

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