You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I want to change my reservation due to postponed of my exam, so please help me in changing.

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: To proceed further, may I know your name?

USER: Sure, I am Matthew Gonzalez.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, I will wait.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: No worries, thank you.

ASSISTANT: Thank you for availing us.