You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Scott Mitchell. I want to book a flight ticket from ORD to DCA. Please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are from 06/04 to 06/06.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfortable with any class.

ASSISTANT: At what time do you like to leave from ORD?

USER: I would like to return on morning.

ASSISTANT: Sorry, there is no flight on your details.

USER: Thank you.

ASSISTANT: Thank you.