You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you now?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, I will help you with that. May I know your name?

USER: Betty Lewis is my name.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: OK.

ASSISTANT: Thanks for waiting, sorry there is no reservation found on your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.