You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from IAD to DTW, can you help me?

ASSISTANT: Let me know your travelling dates.

USER: My travel dates are Oct 15 and 17.

ASSISTANT: Do you have any preference?

USER: I prefer a connecting flight.

ASSISTANT: Can I know your name?

USER: I am Samantha Young.

ASSISTANT: Sorry, no flights found for your travelling dates. Thank you.

USER: No problem, thanks for checking.