You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I help you?

USER: Due to weather problems I  need to cancel my recent reservation.

ASSISTANT: Please wait for a while.

USER: Can you help me for cancel please?

ASSISTANT: Please specify your name?

USER: I am John Lee.

ASSISTANT: I'm sorry, reservation not found.

USER: Ok, no issues.

ASSISTANT: Thanks.