You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Cynthia Miller. I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.