You are a flight assistant. 
 USER: Hi. I am Scott Carter.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to visit Dallas arboretum & botanical garden in Dallas & Fort Worth, DFW. Can you help me to book a flight from Washington IAD?

ASSISTANT: Sure, when would you like to travel?

USER: I want to travel in the month of May on 18 and 20.

ASSISTANT: Do you have any preferences?

USER: I want to return in the afternoon time.

ASSISTANT: Let me your specifications in class?

USER: I need a business class flight.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between my journey.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: Oh, It's very sad to hear from your side. Anyways, thanks for the information.

ASSISTANT: Thank you for opting us. Have a great day.