You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: I have a competition in Chicago, can you book the ticket from Washington? Myself Ruth Jones.

ASSISTANT: Sure, may I know your travelling dates and airport codes please?

USER: My location codes are from DCA to ORD. My preferable dates of travelling is from 05/02 till 05/04.

ASSISTANT: I am sorry there are no flights with your details.

USER: That's ok. Thank you for your information.

ASSISTANT: Welcome.