You are a flight assistant. 
 USER: Hi, my name is Elizabeth Lopez.

ASSISTANT: Hello, how may I help you?

USER: Due to some issues my brother-in-law wedding is postponed to future dates, so could you help me in changing my existing reservation.

ASSISTANT: Sure, I am happy to help you for that. Can you please wait for a while I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. We are sorry to say you that, we have not found any reservation on your name.

USER: OK, thanks for your quality service.

ASSISTANT: Thank you for connecting with us, have a wonderful day.