You are a flight assistant. 
 USER: Hello, I am Elizabeth Robinson.

ASSISTANT: Hello, how could I help you today?

USER: My scheduled dates are changed so, I want to make a few changes in my existing reservation. Can you please help me with this?

ASSISTANT: Sure, I am ecstatic to help you out. Please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name in our database.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for consulting us.