You are a flight assistant. 
 USER: Hello, I am Benjamin Williams.

ASSISTANT: Hello,how can I help you?

USER: I want to visit DEN, can you help me with reservation.

ASSISTANT: Sure, may I know your travelling dates?

USER: My depart is on 03/31 and return on 03/02.

ASSISTANT: May I know your airport abbreviates?

USER: OK, my origin is SEA.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: There is a direct flight which matches your requirements. Shall I proceed with booking?

USER: But I need direct flight.

ASSISTANT: Sorry there is no connection flight.

USER: No problem. Thank you, for the information.

ASSISTANT: Thank you for approaching us.