You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Lewis. Can you please change my existing reservation? because my sister reserved me a ticket with a wrong airport and location.

ASSISTANT: Please wait a while, I will check and inform you. There is no reservation on your name in our database.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.