You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I would like to change my existing reservation, due to postpone of my seminar. Can you please help me in changing?

ASSISTANT: Sure, may I know your name?

USER: Patrick Roberts is here.

ASSISTANT: Give me a minute for checking.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.