You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Margaret Williams. Can you help me in booking my flight ticket from ORD to IAD?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates will be Nov 26 to Nov 28.

ASSISTANT: Do you have any airline preferences?

USER: I need a connecting flight with depart time morning.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: That's fine, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.