You are a flight assistant. 
 USER: Hi, I am Stephanie Smith.

ASSISTANT: Hello. How can I aid you?

USER: I need to book a flight ticket from DEN to BOS to attend a board meeting. Can you helkp me.

ASSISTANT: Sure. Can I know your travelling dates?

USER: I would start on 12/18 and return on 12/20.

ASSISTANT: We found a Delta airline, flight number:1007 and the price is 100.

USER: Ok, please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you for choosing us.