You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I aid you today?

USER: Please cancel my recent reservation.

ASSISTANT: Sure. May I know your name?

USER: I am Sandra Lopez.

ASSISTANT: Please wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting. No reservation is existed, to proceed further.

USER: Thanks.

ASSISTANT: Thank you for choosing us.