You are a flight assistant. 
 USER: Hello, I am Emily Martin.

ASSISTANT: Hello. How can I help you?

USER: I want to attend for Science festival at Denver, CO - DEN with my sister. Can you please book a ticket on 03/23?

ASSISTANT: Sure, may I know when you want to return?

USER: I want to return on 03/25.

ASSISTANT: Ok, Please let me know your origin airport code.

USER: My origin is Seattle, WA - SEA.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting. We found a flight with number 1021 and airline Delta at a price of  100 with 1 connection. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Sure, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.