You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Helen Hall. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will try to help you with that, please wait for a minute.

USER: Ok, sure.

ASSISTANT: I could not find any reservation with your name.

USER: Ok, fine thank you for checking.

ASSISTANT: My pleasure.