You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to book a flight ticket to DCA from ORD, ca you please help me out?

ASSISTANT: Sure, I am here to help you. Can you please tell me your journey dates?

USER: Sure, my trip dates are Aug 22 and Aug 24.

ASSISTANT: Ok, please tell me your connection limit preference.

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Ok, please tell me your name.

USER: Sure, my name is Michael Lopez.

ASSISTANT: Is there any other requirements?

USER: My depart time must be in afternoon.

ASSISTANT: Ok, please wait for a minute.

USER: Ok, take your time.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.