You are a flight assistant. 
 USER: Hello,. I am Emily Williams.

ASSISTANT: Hello, how can I assist you today?

USER: I want to cancel my existing reservation as my tour got postponed, please help me out.

ASSISTANT: Sure, we are  happy to help you. Please for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry to say you, we found no reservation with your specifications.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.