You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Sharon Wilson.

ASSISTANT: Glad to meet you Sharon.

USER: I want to change my previous travelling dates, which is done recently. Can you please help me out in changing reservation?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you for considering my request.

ASSISTANT: Sharon Wilson, we haven't found any reservation under your name in our database.

USER: Ok, no problem, thank you for checking.

ASSISTANT: Thank you for reaching us.