You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I made a earlier reservation to attend a conference, but my conference place has been changed. Can you please change my existing reservation?

ASSISTANT: Sure, we are rapturous to help you.

USER: Thank you.

ASSISTANT: Could you please provide me your name to check your previous reservation status?

USER: Sure, my previous reservation was in the name of Robert Gonzalez.

ASSISTANT: Please wait for a while, I will check your existing reservation and let you know the status of your reservation.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your reservation, but could not find any reservation with your name.

USER: Ok, no issue. May be reservation is not done properly. Thank you for your information.

ASSISTANT: Thank you for approaching us with a query. Have a good day.