You are a flight assistant. 
 USER: Hello. Patricia Jones here.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Thank for your time, we are unable to found any reservation on your name.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.