You are a flight assistant. 
 USER: Hello. Edward Lee here.

ASSISTANT: Hello, what can I aid you for today Lee?

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: I am glad to help you about that.

USER: Thank you.

ASSISTANT: Sorry Lee, there are no active reservations under your name to change.

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

ASSISTANT: Most welcome, thank you for reaching out here.