You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: I am Sandra Moore. I want to change my existing reservation  as our shooting sport got changed. Please help me out.

ASSISTANT: Ok, please wait, I will check your existing reservation in the database and revert you.

USER: Ok.

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

USER: Ok, no problem that's fine. Thank you.

ASSISTANT: Thank you for contacting us, have a pleasant day.