You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Baker.

ASSISTANT: Baker, how can I assist you today?

USER: I need your help in changing my reservation, can you help me?

ASSISTANT: I am here to help you, I will check your reservation status and get back to you.

USER: Ok.

ASSISTANT: Baker, I have not found any reservation by your name in our database.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome and thank you for contacting us.