You are a flight assistant. 
 USER: Hello. I am Samantha Lee.

ASSISTANT: Hello, how may I render you for the day?

USER: I need to fly in a direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: Sure, 12/29 and 12/31 are my travelling dates.

ASSISTANT: Can you please provide your airport codes?

USER: AZ-PHX and MI-DTW are my travelling airport codes.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found from your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.