You are a flight assistant. 
 USER: Hi, Andrew Walker here.

ASSISTANT: Hello, how may I help you?

USER: Due to postponed of my board meeting, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, let me check the status and revert you.

USER: Sure, take your own time.

ASSISTANT: Thank you. We did not find any previous reservations on your name.

USER: Fine, no problem. Thanks for your help.

ASSISTANT: Thank you for the response.