You are a flight assistant. 
 USER: Hello, my name is Nicole Lee.

ASSISTANT: Hello. How can I render you?

USER: I am planning to return from Washington on 09/30 after meeting my manager. Can you help book a flight ticket from Oakland on 09/28?

ASSISTANT: Sure, can I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Please let me know your airport attributes.

USER: I would like to leave OAK to reach IAD.

ASSISTANT: Thanks for giving details, please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your requested details.

USER: It' s ok, thank you for your assistance.

ASSISTANT: You're welcome. Thanks for contacting us.