You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My interview has been postponed, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, please wait a moment.

USER: Sure, I am Richard Miller.

ASSISTANT: Sorry Richard Miller, there is no reservation found on your name.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for approaching us.