You are a flight assistant. 
 USER: Hello, I am Richard Garcia.

ASSISTANT: Hello, How may I assist you?

USER:  I would like to book a flight ticket to Houston, TX - IAH to attend board meeting with my company authorities. Can you help me in booking a flight ticket within the price of 1000?

ASSISTANT: Sure, May I know the source code?

USER: I want to fly from Denver, CO - DEN.

ASSISTANT: Please help me with your travel dates.

USER: I intend to return on 02/01 and want to start my journey on 02/01. I want to start on 01/30.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you.