You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Joshua Rodriguez.

ASSISTANT: Ok.

USER: I need to cancel my recent reservation because my trip dates are postponed.

ASSISTANT: Sure, will you please give me a moment?

USER: Thank you for your positive response.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: It's ok, not a poblem.

ASSISTANT: Thanks for reaching us, have a great day.