You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Robert Roberts here.

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I want to cancel recent reservation due to heavy rains. Can you help me in this one?

ASSISTANT: Ok, I will help you. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome, have a nice day.