You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I have planned to visit all historical places at Washington. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, we are glad to help you in booking. Would you like to travel in a connecting flight or a direct flight?

USER: Sure, I prefer to travel in a connecting flight.

ASSISTANT: Could you please share your departure and arrival dates to proceed further?

USER: I intend to depart on Dec 19 and return on Dec 21.

ASSISTANT: Please share if you have any other comforts in between your journey.

USER: No, I do not have any other specifications.

ASSISTANT: Can I know from where would you like to take off and land on?

USER: My travelling airport codes are LAX and IAD.

ASSISTANT: May I know your name please?

USER: I am Benjamin Allen.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: No problem, thank you for the information. I will wait for your response.

ASSISTANT: Thank you for waiting, sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you.