You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. will you help me with that?

ASSISTANT: Can I know your name?

USER: Thank you for accepting my request, myself Kenneth Lewis.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, not an issue,.

ASSISTANT: Thank you.

USER: Thank you for your information.