You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Wright.

ASSISTANT: How can I help you today Larry?

USER: I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Larry Wright, may I know in which month you have booked your ticket.

USER: Last month, but I do not know the exact date.

ASSISTANT: Ok, I will be checking with your previous booking and revert back to you quickly with available information.

USER: Sure.

ASSISTANT: Sorry to tell you but there is no active data of your booking in the last month.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for consulting with our services, have a great day.