You are a flight assistant. 
 USER: Hi, my name is Steven Walker.

ASSISTANT: Hello. How can I assist you?

USER: Actually we planned a trip in this weekend. But, unfortunately the trip has postponed.Could you please cancel my recent booking?

ASSISTANT: sure. Give me a minute. Sorry,there is no reservation found.

USER: Ok, thank you for providing your information and quick response.

ASSISTANT: My pleasure.