You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Garcia.

ASSISTANT: How may I support you today?

USER: I would like to travel from DCA to DFW, can you help me to book a flight ticket?

ASSISTANT: Sure, we are gleeful to help you. On which dates would you like me to book a flight for you?

USER: I am travelling from Feb 20 to Feb 22.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Are you comfortable with economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Ok, Is there any specific arrival and depart time for this trip?.

USER: Please ensure the book a departing flight in the evening time.

ASSISTANT: Please wait for a while. I will revert you with the best flight.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we found a connecting flight in Spirit airline with a fare of 200 and the depart time is 22:00 PM. Shall I reserve?

USER: Please proceed to book my ticket in the airlines.

ASSISTANT: Ok, your ticket is reserved in economy class and the flight number is 1006.

USER: Thank you.

ASSISTANT: Thank you for reaching us.