You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I am Kevin Carter, help me to book a  direct flight from Boston to Houston.

ASSISTANT: Sure, I will help you with booking. Please forward your trip dates?

USER: I will fly on 05/17 and return on 05/19.

ASSISTANT: Help me with your airport codes?

USER: I will fly from MA- BOS to TX-HOU.

ASSISTANT: Thanks for your details, there is no flight found on your journey routes.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for visiting us.