You are a flight assistant. 
 USER: Hello, I am Raymond Johnson.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight to attend a client meeting in Boston, so please book a flight ticket from Houston.

ASSISTANT: Sure, I am glad to help you. Could you please share your trip dates?

USER: I want to fly on Aug 14, return on Aug 16.

ASSISTANT: Can you please provide me your airport codes?

USER: My source and destination airport codes are HOU and BOS.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.