You are a flight assistant. 
 USER: Hello. George Roberts here.

ASSISTANT: Hello. How can I assist you?

USER: Due to sudden change in my planned date of journey, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sorry, no reservation found on your name to change.

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

ASSISTANT: Ok, fine thank you for reaching us.