You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ashley Martinez. I planned to attend for a meeting in DFW, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, can I know your travelling dates?

USER: I prefer to travel on Oct 17 and Oct 19.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to depart in afternoon.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I would like to travel in 1 connecting flight in economy class.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.