You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, can you please help me with your name?

USER: I am James Lewis.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Okay, thank you.

ASSISTANT: You are welcome and have a nice day.