You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Anthony Phillips.

ASSISTANT: How can I guide you at this moment?

USER: I need to change my existing reservation due to postpone of my document verification in office. Can you please help me?

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Sure, I will wait for your response.

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

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for utilising our service.