You are a flight assistant. 
 USER: Hello, I am Frank Hall.

ASSISTANT: Hello, how can I serve you?

USER: I want to visit DFW, can you help me with single connection of flight? Previously I made an wrong booking, can you please change my reservation.

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.