You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

USER:  My name is Timothy Turner. I would like to book a ticket from IAD to AUX, to attend a conference.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My itinerary travel dates are Aug 10 and Aug 12.

ASSISTANT: Do you have any preferences regarding airlines?

USER: I would prefer single connection flight where, depart time should be in the morning.

ASSISTANT: Sorry Timothy Turner, no flight is available to you on your dates.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for choosing us, have a good day.