You are a flight assistant. 
 USER: Hello.

ASSISTANT: hello, how can I help you?

USER: Here Emily Nelson. I want to book a flight ticket to meet my brother marriage.can you please check for the flights from IAD-SEA?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are May 16th to May 18th.

ASSISTANT: Sorry, there were no flights with your dates.

USER: Not a problem, I will go by road trip to complete my trip. Anyways thank you for the information.

ASSISTANT: Thank you.