You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: I am Susan Adams. I want to change my reservation.

ASSISTANT: Sure, I am here to help you. Ok, wait for a minute, so that I will check about your previous reservation. Sorry to say that, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.