You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I need to book a flight ticket from IAD to DCA to enjoy Innovation festivals.

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I want to fly on Jul 6 and Jul 8.

ASSISTANT: Do you have any specifications?

USER: I would like to fly in a normal cost airline like UA, AA Delta and Hawaiian.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no issues.

ASSISTANT: May I know your name?

USER: Sure, David Lopez here.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.