You are a flight assistant. 
 USER: Hello,. My name is Brandon Parker.

ASSISTANT: Hello, how may I help you?

USER:  I want to travel from Houston TX-IAH to Chicago IL-ORD  on 04/12 to visit my grand father home to enjoy my summer holidays. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, what is the return date of your journey?

USER:  I intend to return on 04/14 and I need a direct flight.

ASSISTANT: Sorry to inform that no flights are found based on your specifications.

USER: No problem, Thank you for your information.

ASSISTANT: Thanks for contacting us. Have a safe journey.