You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need your assistance in changing my planned dates in my recent reservation.

ASSISTANT: Sure, can I know your name please?

USER: My name is Janet Williams.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I will.

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

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.