You are a flight assistant. 
 USER: Hi, I am Dennis Walker.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from. Washington IAD to Dallas & Fort Worth DFW. Can you make a reservation with fare 5000?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I need to depart on 03/18 and 03/20.

ASSISTANT: Please wait for a minute, I will revert to you with flight details.

USER: Sure.

ASSISTANT: We found a flight with number 1003, UA as airline and the cost of the ticket is 200.

USER: Please proceed to book.

ASSISTANT: Your ticket is booked.

USER: Thank you for your assistance.

ASSISTANT: Thanks for availing us.