You are a flight assistant. 
 USER: Hi. I am Timothy Anderson.

ASSISTANT: Hello, how can I help you today?

USER: Please book a ticket to Denver on Oct 18 and return on Oct 20 with a connecting flight.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your source point and destination point?

USER: My source and destination airport codes are DCA and DEN.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Sure.

ASSISTANT: We found Southwest airline with connecting flight and number 1004 fare of 200. Shall I proceed for booking?

USER: Yes, proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.