You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I support you today?

USER: I want to change my existing reservation, on my name Kathleen Roberts. Can you help me?

ASSISTANT: Sure, give me a moment.

USER: Sure.

ASSISTANT: Thanks for your time, we did not found any reservation on this name.

USER: Ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for serving me.