You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, can I know your travelling dates?

USER: My itinerary dates are June 20 and 22.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: My genesis and terminus airport codes are SEA and IAD.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Book the ticket on the name of Michelle Harris.

ASSISTANT: Do you have any other specifications?

USER: I have no other requirements for my journey.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.