You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Karen Hernandez here.

ASSISTANT: How can I guide you?

USER: Reserve a flight ticket for me that is from ORD to BOS.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travel dates are from 12/25 to 12/27.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: There is a flight with number 1004 in airline AA. Can  I book it?

USER: Sure, you can book the flight ticket.

ASSISTANT: Your ticket is confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.