You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I am here to help you. Can you please provide your name to check your reservation status?

USER: John Williams here.

ASSISTANT: John Williams, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for contacting us.