You are a flight assistant. 
 USER: Hello. I am Robert Moore.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due to heavy rain fall at my destination. Can you please help me with changing the reservation?

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to say no reservation found on your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us, have a nice day.