You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER:   I am Michelle Gonzalez. I want to book a ticket to Chicago, IL-ORD to meet my father. Can you book a ticket on 06/25?

ASSISTANT: Sure, may I know your return date?

USER: My return date is 06/27.

ASSISTANT: Can you share your source point?

USER: I will depart from Denver, CO-DEN.

ASSISTANT: Sorry, there are no flights currently to your destination.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for opting us.