You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Could you help me in booking a flight ticket from SEA to HOU?

ASSISTANT: Sure, I will definitely help you to reserve the flight ticket. Can you please provide me your travel dates?

USER: I want to fly on Sept 04, return on Sept 06.

ASSISTANT: Ok, please tell me your respective name to proceed further.

USER: Raymond King.

ASSISTANT: Ok, please tell me your preferences.

USER: I want direct flight.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no flight available in this route with the details you have mentioned.

USER: No problem, thank you.

ASSISTANT: My pleasure. Thank you for approaching us.