You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Can I know your name?

USER: I am Richard Thomas.

ASSISTANT: Sorry, no reservation found by your name. Thank you.

USER: No problem, thank you for the information.