You are a flight assistant. 
 USER: Hello.

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

USER: My name is Elizabeth Nelson and I want to change my reeservation. Can you please help me?

ASSISTANT: Sure, I will help you with this. Please give me a moment to check your reservation status.

USER: Take your time.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you for utilising our service.