You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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, may I know your name please?

USER: Sure, I am Shirley Martin.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Sure, I will wait.

ASSISTANT: Sorry Shirley Martin, there is no reservation on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you.