You are a flight assistant. 
 USER: Hello. Myself Kathleen Nelson.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: I need to change my existing reservation, can you please help?

ASSISTANT: Sure, I can help you in that.

USER: Thank you for kind response.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: I will be waiting for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: That's ok, thank you for searching the details.

ASSISTANT: Thanks for communicating with us.