You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Paul Hernandez.

ASSISTANT: How can I assist you at this moment?

USER: Due to some personal issues, I would like to postpone my meeting. Can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you with this. Please be on hold while I check your reservation status and get back to you.

USER: Sure, take your time.

ASSISTANT: Paul Hernandez, there is no active reservation found under your name in our database.

USER: Its ok, I guess something has happened while booking the ticket. Anyways, thank you for the information.

ASSISTANT: Thank you for utilising our services.