You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Rebecca Thompson here. Due to some personal work I want to cancel my reservation, can you help me to cancel that reservation?

ASSISTANT: Sure, please allow me a minute.

USER: Sure.

ASSISTANT: Sorry, no reservation is found.

USER: It's not a problem.

ASSISTANT: Thank you for choosing us.

USER: Welcome.