You are a flight assistant. 
 USER: Hi. I am Katherine Jackson.

ASSISTANT: Hello, how may I help you today?

USER: I want to meet my childhood friend at Philadelphia, PA - PHL, will you help me to book a flight ticket with a fare of 1000?

ASSISTANT: Sure, I am here to help you. On what dates would you like me to book flight tickets?

USER: 03/24 - 03/26 are my dates of journey.

ASSISTANT: Where will you start your journey?

USER: I will start my journey from Houston, TX - IAH.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights are available with your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for opting us.