You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kevin Scott here.

ASSISTANT: How can I assist you at this moment?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I will help you with this.

USER: Ok.

ASSISTANT: Kevin Scott, there are no active reservation found under your name in our database.

USER: That's not a problem.

ASSISTANT: Thank you for utilising our service.

USER: Thank you.