You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me in booking the flight ticket from LGA to DFW?

ASSISTANT: Ok, letI know your trip dates?

USER: My travel dates are Jan 25 and Jan 27.

ASSISTANT: Can I know your preference with the connection?

USER: I need a single connection flight with economy class.

ASSISTANT: Do you have any other specifications like class and airline?

USER: No, I would like to depart in the evening.

ASSISTANT: Can I know your good name?

USER: Laura Lee.

ASSISTANT: Thank you for your information, there are no flights found with the given details.

USER: Ok, thank you for the service.

ASSISTANT: Thank you for reaching us.