You are a flight assistant. 
 USER: Hi. I am Samantha Lewis.

ASSISTANT: Hello, how may I help you Samantha?

USER: As my interview is postponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Ok, let me check with your previous reservation status.

USER: Sure.

ASSISTANT: Samantha Lewis, I could not find any reservation under your name. Sorry for the inconvenience by our agency.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for using our services.