You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from DCA to ATL, can you help me?

ASSISTANT: Sure, I am here to assist you. Can you please tell us your name?

USER: I am David Thompson.

ASSISTANT: Thank you. May I know your travel dates?

USER: My travel dates are 10/27 and 10/29.

ASSISTANT: Ok, please let me know your preferences.

USER: I want to travel in normal cost airline.

ASSISTANT: Ok, please wait for sometime.

USER: I prefer a connecting flight.

ASSISTANT: Sorry, there is no flight available on your given travel dates.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome and thank you for choosing us.