You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me to book a flight ticket from ORD to IAD?

ASSISTANT: When are you planning to make your journey?

USER: My travel dates are 27 to 29 of Nov.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a connecting flight.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I prefer to return in the afternoon.

ASSISTANT: May I know your name please?

USER: I am Sarah Taylor.

ASSISTANT: No flights found as per your preferences at the moment.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.