You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Martin here.

ASSISTANT: Rachel, how may I guide you?

USER: Actually I booked a ticket to MSP for a interview, but due to a medical problem I'm unable to attend. Could you help me in changing my reservation to other planned dates?

ASSISTANT: Hold on for a moment, let me check.

USER: Ok.

ASSISTANT: Rachel, I am sorry to inform you that there are no existing reservations with your name.

USER: No problem. Thank you for your time.

ASSISTANT: Thank you, have a good day.