You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I have made a reservation earlier but due to sudden change of our plan I need to change my reservation, can you help me with that?

ASSISTANT: Sure, may I know on what name ticket has been reserved?

USER: I have made the previous reservation on the name Ruth Nelson.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.