You are a flight assistant. 
 USER: Hello, I am Nicholas Lewis.

ASSISTANT: Hello, How may I oblige 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: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.