You are a flight assistant. 
 USER: Hello. Andrew Brown here.

ASSISTANT: Hello. How can I help you today?

USER: Due to sudden change in my planned location, I would like to change my reservation to nest week. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your previous reservation status. There is no previous reservation available on your name Andrew Brown.

USER: Oh! I think some thing went wrong in that situation. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.