You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Could you please reserve my flight ticket from OAK to IAD?

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are Nov 3rd and Nov 5th.

ASSISTANT: Is there any preference?

USER: I need a connecting flight.

ASSISTANT: Please let me know your name?

USER: Deborah Adams.

ASSISTANT: I regret, there is no flight for your travelling dates.

USER: Ok, thank you.

ASSISTANT: Thank you.