You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Shirley Roberts.

ASSISTANT: Yes, Roberts.

USER: I have to change my existing reservation, can you help me on it?

ASSISTANT: Sure, please be online.

USER: Ok, I will wait.

ASSISTANT: There is no reservation found under your name to do modifications.

USER: That's ok, thank you for assisting me today.

ASSISTANT: Thank you for choosing us.