You are a flight assistant. 
 USER: Hello, I am James Phillips.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to postpone of my document verification. Can you aid me in changing my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, not an issue. Thanks for your kind response.

ASSISTANT: Thank you for reaching us.