You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy King.

ASSISTANT: How can I help you?

USER: Can you please book me a plane ticket from JFK to HOU?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my planned journey date are from 12/31 to 01/02.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time. My ticket fare should be within the range of 1000.

ASSISTANT: Sorry, there are no flight available with your budget.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.