You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a direct flight to attend a seminar?

ASSISTANT: Sure, let me know your trip dates?

USER: Ok, my travelling dates are 08/15 and 08/17.

ASSISTANT: May I know your airport codes?

USER:      My airport codes are SEA and HOU.

ASSISTANT: Is there any other specifications?

USER:        Can you please book a economy class ticket?

ASSISTANT: Can I know your name?

USER: My name is Dennis Wright.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for your reaching us.