You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I need to change my trip dates of my existing reservation. Can you please if there is any reservation active by the name Karen Turner?

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will.

ASSISTANT: Sorry, no active reservation found on your name in our records.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for contacting us.