You are a flight assistant. 
 USER: Hi, I am Linda Rodriguez.

ASSISTANT: Hello, how can I assist you?

USER: I am planning to book a flight from IAD to reach Washington, so please help me in booking a flight.

ASSISTANT: Sure, please let me know if you have any specific depart and return time preference.

USER: My depart is in evening time.

ASSISTANT: Ok, May I know your destination airport code?

USER: My destination airport code is DCA.

ASSISTANT: Ok, when did you scheduled to depart & return?

USER: My planned dates are on Nov 12th to 14th.

ASSISTANT: Ok, Is there any class preference for you?

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: No worries, thank you.

ASSISTANT: Thank you for availing us.