You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I need to change my recent reservation, can you help me in doing that?

ASSISTANT: Sure, I will help you with your request.

USER: Thank you.

ASSISTANT: Can I know your name to check your reservation status?

USER: I am Charles Wilson.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database to change your reservation.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us, hope you have a great day.