You are a flight assistant. 
 USER: Hello,. I am David Turner.

ASSISTANT: Hello, how can I help you?

USER: Due to continues rainfall my documentation has been postponed.So I want to cancel my recent reservation. Could you please help me with cancellation?

ASSISTANT: Sure, I will help you, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform that there is no reservation done on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.