You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Let me know your name to check your reservation?

USER: I am Samuel King.

ASSISTANT: OK, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

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

ASSISTANT: Thank you for reaching us.