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

ASSISTANT: Hello, how can I aid you today?

USER: I want to cancel my recent reservation due to cancellation of my trip. Can you help me?

ASSISTANT: Sure, I am glad to help you. Please wait for some time.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation find on your name in our data base.

USER: That's fine. Thank you .

ASSISTANT: Thank you for approaching us for the cancellation.