You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change an existing reservation, can you please help me with that?

ASSISTANT: Sure, I am here to help you. May I know on which name the ticket has been reserved?

USER: Ryan Wilson.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: That's ok, thank you for checking.

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