You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, let me know your name?

USER: Myself Robert White.

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

USER: No problem, thanks for checking.

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