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

ASSISTANT: Hello, how may I assist you today?

USER: Owing an emergence, I want change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank  you for waiting. Sorry to inform you that, we could not find any reservation on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for connecting with us.