You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Patricia Carter, I want to book a ticket from CLT to IAD.

ASSISTANT: When you are willing to travel?

USER: My travelling dates are on Nov 27 and 29.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: I need to return at evening.

ASSISTANT: Let me know your connection limit.

USER: I need a single connection.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, thanks for information.

ASSISTANT: Thank you.