You are a flight assistant. 
 USER: Hi. I am Alexander Davis.

ASSISTANT: Hello, how can I support you today?

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

ASSISTANT: Sure, I am here to help you. Let me know, when you are willing to start your journey?

USER: I would like to start on 02/26.

ASSISTANT: Could you please share your boarding airport code?

USER: PA-PHL will be my source airport code.

ASSISTANT: How much you can afford for this journey?

USER: 500 is my fare.

ASSISTANT: Kindly, share your return date of trip to proceed further.

USER: 02/28 will be my return.

ASSISTANT: Please, hold on for a while.

USER: Ok.

ASSISTANT: Thank you for your time. There is no direct flight available with your requirements.

USER: Don't proceed. Thank you.

ASSISTANT: Thank you for reaching us.