You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit Washington, can you please book me a ticket from DTW to IAD?

ASSISTANT: Sure, may I know your name please?

USER: My name is Nicole Lee.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My preferable journey dates are Jan 18 and Jan 20.

ASSISTANT: May I know your airline preference please?

USER: I am comfortable with any airlines.

ASSISTANT: May I know your connection limit please?

USER: I prefer connecting flight for this journey.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome.Thank you for reaching us.