You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Lisa Perez. Owing an emergency want to change my reservation, can you help me out with this please?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: That's fine, thank you for the response.

ASSISTANT: Have a nice day.