You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking a flight ticket to DCA from LAS?

ASSISTANT: I am here to help you, may I know your trip dates?

USER: Sure, my trip dates are Dec 06 and Dec 08.

ASSISTANT: May I know your airline preferences?

USER: I do not have any such preference.

ASSISTANT: Is there any other specifications?

USER: I need single connecting flight for my journey.

ASSISTANT: May I know your good name?

USER: Sure, my name is Angela Taylor.

ASSISTANT: There is a connecting flight-1002 in economy class, shall I proceed?

USER: Yes, do proceed with the booking.

ASSISTANT: Ok, booking is done on Delta airlines.

USER: Thank you.

ASSISTANT: Thanks for reaching us.