You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Mitchell.

ASSISTANT: How can I assist you?

USER: I am planning to attend music concert at BOS, can you please help me with booking a flight ticket from DCA?

ASSISTANT: May I know your travel dates?

USER: Sure, I would like to take off on Dec 14 and return on Dec 16.

ASSISTANT: Do you have any peferences?

USER: I need a flight with 1 connection.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.