You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Catherine Robinson.

ASSISTANT: How can I help you today?

USER: I am planning to change my previous reservation due to some issues, can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Ok, Please wait a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available on your name.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us, have a good day.