You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: The location of my interview was shifted last minute, can you please help me in modifying my existing reservation?

ASSISTANT: Sure, please provide your name for checking the reservation.

USER: Ok, I have reserved it on the name of Joshua Hill.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There are no reservation found under your name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Welcome, have a great day.