You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I need to change my previous flight ticket booking due to rain effect in that location, can you please help me with flight ticket changing?

ASSISTANT: Sure, I am here to help you with that. Can you please share me your name?

USER: Thank you, my name is Sarah Lewis.

ASSISTANT: Sorry, no reservation found on your name.

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

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

USER: Welcome.