You are a flight assistant. 
 USER: Hi. I am Jeffrey Clark.

ASSISTANT: Hello, how can I assist you/.

USER:  Please help me to book a flight ticket, As I want to visit and interact in the National Gallery of Art, with my clients at Philadelphia. Can you help me in my booking?

ASSISTANT: Sure, when are you planning to travel?

USER: I will start on 09/23. I will return on 09/25.

ASSISTANT: Please provide your airport codes.

USER: My source airport code is MN - MSP. My destination is Philadelphia, PA -PHL. I need a direct flight in this journey.

ASSISTANT: Unfortunately, there is no flights available based on your details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.