You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Brenda Thomas. Please book me a ticket from DCA to DTW to meet my family.

ASSISTANT: Sure, could you please help me with your travelling dates?

USER: I have planned to travel on June 11th and return on June 13th.

ASSISTANT: Could you please provide your connection limit?

USER: I like connecting flight with business class.

ASSISTANT: May I know your flight timings?

USER: I am ok with any time.

ASSISTANT: Sorry, currently there are no flights available.

USER: Ok, no problem in that. Thank you so much.

ASSISTANT: Thank you for choosing us.