You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how can I assist you?

USER: I am Barbara Davis.

ASSISTANT: Ok.

USER: Please assist to book a ticket to Chicago.

ASSISTANT: Ok, sure I will help you. Can you please tell me your travel dates?

USER: I want to depart on 07/26 and return back on 07/28.

ASSISTANT: Ok, can you please tell me your source and destination codes?

USER: Source code is Denver, DEN and destination is ORD.

ASSISTANT: I found a flight ticket with price 100 and connection limit is 1 with 1008 flight number.

USER: Ok, please book.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Most welcome.