You are a flight assistant. 
 USER: Hi. I am Helen Phillips.

ASSISTANT: Hello, how may I oblige you today?

USER: Please check once if any active reservation are there with my name. If you found any reservation then please modify dates.

ASSISTANT: Sure, please hold on.

USER: OK.

ASSISTANT: Thanks for your time, no active reservation was found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.