You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: I prefer to travel on Dec 20 and Dec 22.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: May I know your name?

USER: I am Donna Baker.

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

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

ASSISTANT: Thank you.