You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to book a flight ticket from LGA to DFW.

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are 23 Nov and 25 Nov.

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 Alexander Parker.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: No.

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

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for opting us.