You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kathleen Jackson.

ASSISTANT: How can I assist you at this moment?

USER: Can you help me to book a flight from DCA on 10/29?

ASSISTANT: Sure, can you please provide your destination airport code and return journey date?

USER: My destination is IAD. My return date is 10/31.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Kathleen Jackson, there are no flights available on this route due to typical climatic condition.

USER: That is fine. Thank you for your help.

ASSISTANT: Thank you for contacting us.