You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my reservation. Can you please help me out?

ASSISTANT: Ok, sure I am here to help you. Can you please tell me your name?

USER: Sure, my name is Jerry Smith.

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

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

ASSISTANT: Thank you for reaching us.