You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: On my name Patrick Hernandez reserve a seat to Houston, to celebrate my fiance birthday. Can you help me in booking me a direct flight?

ASSISTANT: Sure, May I know the journey codes?

USER: I will start my journey from HOU and return from IAH.

ASSISTANT: Please help me with your trip dates.

USER: 12/10 - 12/12 are my preferred dates to travel.

ASSISTANT: Please wait a second.

USER: Sure.

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

USER: Ok,  I will choose other airline. Thank you.

ASSISTANT: Thank you for reaching us.