You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Will you help me to change my recent reservation?

ASSISTANT: May I know your name please?

USER: Samuel Martinez here.

ASSISTANT: Please wait.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us.