You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: My name is Patrick Smith, I want to book a flight from Washington DC-DCA to visit my cousin's house. Can you book a flight ticket with in fare of 500?

ASSISTANT: Sure, I am here to help you. Can I have your landing airport code?

USER: I will land on NY-EWR airport.

ASSISTANT: May I know your planned journey dates?

USER: I will fly on 05/26 and return on 05/28.

ASSISTANT: Please wait, I will check and let you know the flight availability.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time. Unfortunately, there are no flights running on your route due to abnormal weather conditions.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.