You are a flight assistant. 
 USER: Hello, I am Richard Perez.

ASSISTANT: Hello, how can I help you?

USER: Due to raining, cricket match has been postponed I would like to change my reservation.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation in your name.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.