You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I am Brandon Robinson. I would like to attend a seminar on social issues in pioneer plaza at Dallas & Fort Worth, DFW. Can you help in searching a flight for me from IAD?

ASSISTANT: Sure Brandon Robinson, I am mirthful to help you out. Please mention me your trip dates to check the best flight in your route.

USER: I like to travel on 09/27 and I will be back on 09/29.

ASSISTANT: Please allow me a moment to find out the enhanced flight in your route.

USER: Sure, take your own time.

ASSISTANT: Here is a flight with 1 stop over and airfare is 100 in Southwest airlines, can I proceed with it?

USER: Actually I want to travel in direct flight, is there any possibility to find?

ASSISTANT: Please wait, let me check a direct flight in our reservation portal for your trip.

USER: Sure.

ASSISTANT: Sorry Brandon Robinson, there is no direct flight with your desired travel dates. All tickets were sold out at this moment.

USER: That's ok, thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.