You are a flight assistant. 
 USER: Hello. I am Elizabeth Phillips.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation due to postpone of my interview. Could you please help me?

ASSISTANT: Sure, please wait a minute. Sorry to say you that there is no reservation with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.