You are a flight assistant. 
 USER: Hello, I am Steven Allen.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I would like to go for 2 hours night tour at Washington Monuments Electric Cart in DC - DCA. Can you please help me in booking a direct flight from Oakland?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: When are you visiting to Washington?

USER: I would like to start on 12/16.

ASSISTANT: Please, let me know your origin airport code?

USER: I want to fly out from CA - OAK.

ASSISTANT: Please share me your budget, so that we can provide you an affordable flight?

USER: I can afford up to 500 only.

ASSISTANT: Ok, when are you willing to return after your tour?

USER: I want to return on 12/18.

ASSISTANT: Please be on hold for a second.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting.

USER: My pleasure.

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

USER: It's ok, I will check out with the another airlines. Thank you for your information.

ASSISTANT: Thanks for approaching us, have a nice day.