You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Clark.

ASSISTANT: How can I help you?

USER: I need to cancel my reservation as my leaves got cancelled. So please help me with that.

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Thank you. I will wait for your response.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: I will check my mail and revert you if I am wrong that I did not received cancellation information. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.