You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Lisa Nelson here.

ASSISTANT: How can I assist you now?

USER: Can you changel my flight ticket reservation?

ASSISTANT: Sure Lisa Nelson, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure.

ASSISTANT: Sorry Lisa Nelson, no reservation has found under your name to change.

USER: Not a problem. Thank you.

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