You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for the day?

USER: Can you please help me in booking a flight ticket from ORD to SEA?

ASSISTANT: Sure, Please provide me your planned travel dates to proceed.

USER: I want to fly on June 07 and return on June 08.

ASSISTANT: May I know your name for the documentation purpose?

USER: Myself David Clark.

ASSISTANT: Let me know, if you have any other preferences?

USER: I would like to depart in the afternoon time.

ASSISTANT: Thank you for your details,  I regret to inform you that no flight has been obtained on your travel dates and locations to book a ticket.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.