You are a flight assistant. 
 USER: Hello.

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, may I know your name?

USER: My name is Eric Harris.

ASSISTANT: Please standby.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.