You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Yes, can you tell me your name?

USER: My name is Kimberly Nelson.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.