You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I  serve you today?

USER: I want to change my recent reservation due to heavy snow fall from couple of days. Can you help me with changing?

ASSISTANT: Sure, we are here to help you. May I know on which name the ticket has been reserved?

USER: Justin Allen is my name.

ASSISTANT: Ok, please wait for  few minutes.

USER: Sure.

ASSISTANT: Sorry we couldn't find any reservation with your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for availing us. Have a great day.