You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, I can do that for you. May I know your name?

USER: Thank you for taking my request into consideration, I had reserved it on the name of Mark Lopez.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry, I did not find any reservation under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.