You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, can you share your trip dates?

USER: Thank you. Oct 09th and 11th are my trip dates.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: Can you provide your airport codes?

USER: PHL and BOS are my airport codes.

ASSISTANT: May I know you name?

USER: Amanda Harris.

ASSISTANT: Sorry, there is no direct flight on your given dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.