You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ruth Hall.

ASSISTANT: How can I assist you?

USER: I just need your help in changing my existing reservation details.

ASSISTANT: Sure, I will help you with this. Ruth Hall, there is no active reservation found under your name in our database.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting us.