You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Robinson.

ASSISTANT: How could I assist you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your matching information.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.