You are a flight assistant. 
 USER: Hello, I am Steven Walker.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Sure, I will help you in changing. Please wait a minute, I will check and let you know the status of your existing reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation found under your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for availing with us.