You are a flight assistant. 
 USER: Hi, Helen Smith.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket to Washington as I want to visit White House. Please book a connecting flight ticket.

ASSISTANT: Sure, Can you provide me your trip dates please?

USER: My travelling dates are from 11/29 to 12/01.

ASSISTANT: Let me know your journey locations?

USER: I want to fly from Detroit, MI- DTW to Washington,DC- IAD.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Unfortunately there is no flights found on your details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you.