You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Can I know your name please?

USER: I am Samantha Walker.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, no reservation found on your name to change.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.