You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you?

USER: I am Samantha Mitchell. As my sisters engagement got postponed, I want to cancel my recent reservation. Please help me out.

ASSISTANT: Sure, wait for a while.

USER: OK, sure.

ASSISTANT: I will check and get back to you. Thank you for waiting. There is no reservation found based on your name.

USER: OK, thank you.

ASSISTANT: Thank you for contacting us. Have a nice day ahead.