You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Williams.

ASSISTANT: Joshua Williams. How can I help you?

USER: I would like to book a flight ticket from CLT to DCA, can you please help me in booking?

ASSISTANT: Sure, can you provide me with the journey details?

USER: My travelling dates are Oct 8th and Oct 10th. The depart time should be evening.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any limitations?

USER: I need a flight with single connection.

ASSISTANT: Do you have any other airline requirements?

USER: No, I don't have any airline preference.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform that, there are no flights upon the request of your preferences.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.