You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: My name is Deborah Campbell.

ASSISTANT: Ok.

USER: Can you please change my existing reservation details?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Sorry Deborah, there is no reservation found on your name.

USER: It's ok, thank you for choosing us.

ASSISTANT: Thank you for approaching us, have a nice day.