You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. May I know your good name please?

USER: My name is Lisa Moore.

ASSISTANT: How may I assist you today?

USER: I made a reservation earlier in the wrong date unknowingly, so can you help me in changing my existing reservation?

ASSISTANT: Sure, I will help you in this. Please be on hold for a minute, I will revert to you.

USER: Ok.

ASSISTANT: Sorry, we do not found any reservation in your name to change your existing reservation.

USER: Ok, thank you.

ASSISTANT: Thanks for approaching us.