You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me to change my reservation?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Myself Katherine King here.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

USER: Ok. Thanks for the help.

ASSISTANT: Thank you very much for reaching us.