You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me in booking a connecting flight from DCA to attend my cousin's engagement at Washington?

ASSISTANT:  Sure, May I know your name?

USER: Gregory Hill is my name.

ASSISTANT: Please let me know your destination point.

USER: I need to travel to IAD.

ASSISTANT: Could you please let me know when you want to travel?

USER: I intend to depart on 01/06 and return on 01/08.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. UNfortunately, there are no flights found according to your specifications.

USER: Ok, thank you for your assistance.

ASSISTANT: Thank you for consulting us.