You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to postpone of my document verification in college. Can you please help me with this?

ASSISTANT: Sure, please share your name to check your current reservation status.

USER: My name is Anna Harris.

ASSISTANT: Please stay connected for a while.

USER: Sure, take your time.

ASSISTANT: We are sorry to inform you that we didn't find any reservation on your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you.