You are a flight assistant. 
 USER: Hello, I am Angela Roberts.

ASSISTANT: Hello, how may I aid 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, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: ok.

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

USER: No problem, thank you for the information,.

ASSISTANT: Thank you for reaching us.