You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I am here to help you out with that.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Myself Karen Thompson.

ASSISTANT: Ok, please be on hold, let me check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: That's ok, no problem may be it might went wrong while booking due to server issues. Thank you for the information.

ASSISTANT: Thank you for approaching us.