You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what service do you expect from our agency?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you. Can I know your full name to check the ticket status?

USER: Please check the status on the name of Carolyn Harris.

ASSISTANT: Ok, I need sometime to check the ticket status. Will you please allow me the time?

USER: Sure, take your time.

ASSISTANT: I am really sorry to say that, there is no active reservation found on your name in our portal to change the ticket details.

USER: Ok, thanks for sharing the information.

ASSISTANT: My pleasure to inform you. Thank you for approaching us.