You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: Can you please help me to book a flight from LAX to DFW?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to travel on Apr 23 and need to return on Apr 25.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: If you can help me with your name, I can check with the availability of flights.

USER: I am Melissa King.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: My depart time must be in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for availing us.