You are a flight assistant. 
 USER: Hello, I am Sandra White.

ASSISTANT: Hello, what can I do for you?

USER: I want to cancel my reservation, can you please help me in that?

ASSISTANT: Sure, I am here to help.

USER: Thank you.

ASSISTANT: Please wait while I check your previous reservation details.

USER: Sure.

ASSISTANT: Thank you for waiting, We don't find any reservation on your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your kind response.