You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please check with my previous booking and help me with changing it?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Myself Karen Roberts.

ASSISTANT: Thanks for your name, please wait.

USER: Take your own time.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Oh! That's ok. No issues.

ASSISTANT: Thank you for visiting us.

USER: Welcome.