You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to change my reservation due to my meeting has been postponed, will you help me in changing?

ASSISTANT: Sure, I will help you. May I know your name?

USER: Myself Jack Davis.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Ok, I will wait.

ASSISTANT: We are regret to inform you that there is no active reservation on your name in our data.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.