You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to book a direct flight ticket to attend an emergency case at WA. Can you help me?

ASSISTANT: Sure, I am happy to help you with that. Can I have your  travel  dates please?

USER: 09/10 and 09/12 are my travelling dates.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: LAX and SEA are my airport codes.

ASSISTANT: Do you prefer any specific class to travel?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: No more.

ASSISTANT: Can I have your  good name please?

USER: Jessica Clark.

ASSISTANT: Sorry to inform you that  no direct flight is available to you on your planned dates.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.