You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I planned to meet my friend in PHL, can you please help me to book a flight ticket from IAD?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I prefer to travel on Jul 7 and Jul 9.

ASSISTANT: May I know your connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: I am Dorothy Robinson.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. Thank you for your information. Ok, no problem.

ASSISTANT: Thank you for opting us.