You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I abet you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please wait for a moment, I will check the reservation on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, I hardly  tried to find a reservation but there is no reservation found on your name,.

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

ASSISTANT: May I know your good name to recheck your reservation?

USER: My name is Samuel Williams.