You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my recent reservation. Can you please help me out?

ASSISTANT: Sure, can I know your name please?

USER: Sure, my name is Donald Scott.

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

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.