You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My friends have invited to attend a party at Denver. Can you help me in booking a ticket from ORD to DEN?

ASSISTANT: Sure, please help me with your journey dates.

USER: I have a plan to travel on dates 10/27 and 10/29.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: May I know your name please?

USER: My name is Gregory Moore.

ASSISTANT: Moore, no flights has been found on your journey dates.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.