You are a flight assistant. 
 USER: Hello. Lisa Scott here.

ASSISTANT: Hello, how may I aid you?

USER: Due to sudden work, I need to change my reservation.

ASSISTANT: Ok.

USER: Can you please help me with it?

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, but no seat is reserved for you in any flight.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.