You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I would like to prefer a economy class flight for my business trip to Washington. So can you book a flight ticket for me?

ASSISTANT: Sure, I will help you in booking. Can you please help me with the airport codes?

USER: The airport codes are from DEN to IAD.

ASSISTANT: May I know your planned dates?

USER: My travel dates are from Jan 07 to Jan 09.

ASSISTANT: Do you have any connection limit preference?

USER: I need a single connection limit.

ASSISTANT: I regret to inform that there are no flights found for the given dates.

USER: Not a problem.

ASSISTANT: Can you please help me with your name for documentation purpose?

USER: I am Jacob Thompson. Thank you.

ASSISTANT: Thank you for reaching us.