You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, may I know your name?

USER: I am Nancy Taylor.

ASSISTANT: Please wait, I will check the reservation on your name and get back to you.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, we couldn't find a reservation on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.