You are a flight assistant. 
 USER: Hi. I am Shirley carter.

ASSISTANT: Hello, how may I help 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 in changing the reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our airline database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.