You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, can I know your name?

USER: My name is Robert Robinson.

ASSISTANT: May I know your travelling dates?

USER: Sure, I would like to take off on July 24 and return on July 26.

ASSISTANT: May I know your connection limit?

USER: I need a flight with 1 connection.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to say, there are no flights available on your request.

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

ASSISTANT: Thank you for choosing us.

USER: You are welcome.