You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Eric Hernandez.

ASSISTANT: Ok.

USER: I like to change my reservation, can you help me in that?

ASSISTANT: Ok, sure. Sorry, no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.