You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: I am Gregory Garcia want to travel to DC-IAD to view Niagara water falls. Can you book a connecting flight?

ASSISTANT: Sure, I would be happy to help you. Can you please provide your take off airport code?

USER: I will depart from CA-LAX.

ASSISTANT: May I know when you have planned to travel?

USER: My travel dates are 04/17 and 04/19.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us.