You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: My trip is a round trip please book a ticket from SEA to again SEA. My travelling dates are from 06/13 to 06/15.

ASSISTANT: Please give me a moment.

USER: Myself Matthew Gonzalez.

ASSISTANT: There is a flight available with Delta airlines, shall I book it for you Matthew?

USER: Sure, please proceed the booking.

ASSISTANT: Ok, ticket is confirmed, flight number is 1004.

USER: Thank you so much.

ASSISTANT: Thanks for reaching us.