You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: 09/09 and 09/11 are my travelling dates.

ASSISTANT: Can you please help me with your respective airport codes?

USER: IAD and AUS are my airport codes.

ASSISTANT: Do you have any other specifications?

USER: No more.

ASSISTANT: May I know your good name please?

USER: Sandra Hill here.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: No issue, Thank you.

ASSISTANT: Thank you for choosing us.