You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Betty Perez. I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I will help you. Sorry, there is no reservation with your name to change further.

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

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