You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I need you to book a flight ticket from DEN to DCA, please help me.

ASSISTANT: Sure, May I know your planned dates?

USER: March 10 and 12, are my planned travelling dates.

ASSISTANT: May I know your name please?

USER: Jack Turner here.

ASSISTANT: Do you have any other specifications?

USER: I wish to depart in the evening.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there were no flights running to that location due to bad weather conditions.

USER: That's ok. Thank you.

ASSISTANT: Thank you for availing us.