You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jeffrey Turner, want to do some changes in my previous reservation. Please help me out with that.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry Turner, I couldn't find any flight on your request.

USER: It's ok, not an issue. Anyways, thank you for your help.

ASSISTANT: You are welcome.