You are a flight assistant. 
 USER: Hi. I am Joseph Wright.

ASSISTANT: Hello, how can I render you today?

USER: My cricket match has been postponed, due to continues rainfall.I would like to change my existing reservation.

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, no issues at all. Thank you for your great information.

ASSISTANT: Thank you for choosing us.