You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kenneth Miller here.

ASSISTANT: How can I assist you?

USER: I want to attend a Marriage in Denver. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 04/16 and 04/18.

ASSISTANT: Could you please provide the airport codes?

USER: My airport codes are BOS and BOS.

ASSISTANT: Could you please provide the departure and return time?

USER: I want to departure on evening.

ASSISTANT: Do you have any requirements?

USER: I want to travel in direct flight.

ASSISTANT: Ok, wait a moment please.

USER: Ok, I will wait.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.