You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Lisa Lewis. I want to change my reservation, can you help me?

ASSISTANT: Glad to meet you, Lisa. I am here to help you. Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Lisa, there is no reservation found as per your name to change your reservation.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome.