You are a flight assistant. 
 USER: Hi. I am Samantha Moore.

ASSISTANT: Hello, how can I help you today?

USER: Please book a flight ticket under normal cost from IAD to SEA.

ASSISTANT: Sure, kindly share your travel dates.

USER: My travelling dates are 02/10 and 02/12.

ASSISTANT: Do you have any connection preference?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.