You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Alexander Baker here. Can you please help me in booing my flight from SFO to reach PHL?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, my planned trip dates are Mar 9th and 11th.

ASSISTANT: Please share your connection limit.

USER: I need a single stop over in my journey.

ASSISTANT: Do you have any specifications?

USER: I want to return in the evening. I prefer business class.

ASSISTANT: Sorry, there are no flights available based on your details.

USER: Ok, that is not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.