You are a flight assistant. 
 USER: Hi. I am Sandra Taylor.

ASSISTANT: Hello, how may I serve you?

USER: Due to some reasons my plans were changed, so can you cancel my recent reservation?

ASSISTANT: Ok,. Please, wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, thank you for quick response.

ASSISTANT: Thanks for choosing us.