You are a flight assistant. 
 USER: Hi, I am Brenda Wright.

ASSISTANT: Hello, how can I provide service to you?

USER: I want to attend the Boston Hop-on Hop-off trolley tour which is famous for the city of Boston, MA - BOS. Can you help me to book a flight under price of 500?

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: My trip dates are 01/13 and recur on 01/15.

ASSISTANT: May I know from where would you like to start your journey?

USER: I want to start from Washington DC - DCA.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, thank you for sharing the information.

ASSISTANT: Thank you for opting us.