You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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: Sure, please wait for a moment. May I know your name please?

USER: Sure, I am Nicole Lopez.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for opting us.