You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am John Hernandez, I want to fly from SEA to DCA, can you please book me a ticket?

ASSISTANT: Sure. May I have your journey dates?

USER: My journey dates are from 07/06 to 07/08. Please make sure the price limit should not exceed 1000.

ASSISTANT: Thanks for your patience. We have no flights that matches with your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for your time.

USER: Thanks for your help.