You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, Barbara Lee is my name.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.