You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for the day?

USER: I have a business conference meeting at New York this month. Can you please help me in reserving the ticket from DEN to LGA?

ASSISTANT: Sure, may I know your preferred dates of travel?

USER: I am planning my trip on Sept 29 and again I will be return back on Oct 1.

ASSISTANT: Do you need any stopover?

USER: I am flexible with single connection flight.

ASSISTANT: Is there any other specifications?

USER: My depart time is evening.

ASSISTANT: May I know your name?

USER: Myself Margaret Clark.

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait for your kind response.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.