You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from DEN to PHX, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, my travelling dates are Mar 27 and Mar 29.

ASSISTANT: May I know your connection limit?

USER: I prefer a direct flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Please make sure I would prefer depart time at morning.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no issues. Justin Campbell here.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.