You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, My name is Sarah Lewis.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Lewis, there is no reservation found as per your name in our database.

USER: Ok, No issues, thanks for the information.

ASSISTANT: Thank you for reaching us.