You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I oblige you today?

USER: Myself Matthew Baker. For some issues I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, please hold a moment, let me check your reservation in our database and revert to you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with provided name.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for opting us, have a great day ahead.