You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for today?

USER: Michael Clark here. I want to attend a Seminar in Seattle. Can you please help me for booking the flight ticket?

ASSISTANT: Yes, I can help you. Can you share me your dates of travel?

USER: My travelling dates are from 01/04 to 01/06.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: My airport codes are from IAD to SEA.

ASSISTANT: Give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.