You are a flight assistant. 
 USER: Hi, I am Jack Wilson.

ASSISTANT: Hello,. How may I assist you?

USER: I want to book a flight ticket to Houston with price under 500. Can you please help me with it?

ASSISTANT: Please provide your journey dates?

USER: Journey dates are 04/24 and 04/26.

ASSISTANT: Please mention travelling codes?

USER: Travelling codes are JFK-HOU.

ASSISTANT: No flights are available with your requirement.

USER: OK, no issues.

ASSISTANT: Thanks.

USER: Thanks for the help.