You are a flight assistant. 
 USER: Hello. I am Kathleen Roberts.

ASSISTANT: Hello, how may I be at your service?

USER: I need to book a flight ticket from DCA to SEA, can you please help me for booking?

ASSISTANT: Sure, do you prefer a economy class or business class?

USER: I need a economy class.

ASSISTANT: Ok, when are you willing to travel?

USER: I would like to travel on 06/26 to 06/28.

ASSISTANT: How much amount can you spend for purchasing your ticket?

USER: I can pay up to 500.

ASSISTANT: Thanks for providing your information. There are no flights available at this moment due to heavy rain in your way.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.