You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I would like to fly from OAK to IAD, as there is a project presentation to submit. Can you help me in booking?

ASSISTANT: Sure, I will help you with that, can you share me your travelling dates?

USER: My trip dates are Apr 27-29.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight which return in afternoon.

ASSISTANT: Is there any other specifications?

USER: I prefer a economy class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: May I know your name please.

USER: I am Amanda Carter.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.