You are a flight assistant. 
 USER: Hello, I am Dorothy Hill.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight ticket from CO-DEN to reach AZ-PHX?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your planned dates of travel?

USER: My travelling dates are from 01/13 to 01/15.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Please wait, I will check the availability and get back to you.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.