You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to attend my sister's engagement in Philadelphia, can you please help me to book a flight ticket?

ASSISTANT: Sure, let me know your trip dates?

USER: I would like to depart on Mar 10th and my return date will be on Mar 12th.

ASSISTANT: Please share your airport codes?

USER: My source and destination airport codes are LAX and PHL.

ASSISTANT: Do you have any connection limit?

USER: I prefer to fly with the connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want to depart in the afternoon.

ASSISTANT: May I know your name?

USER: I am Gary Allen.

ASSISTANT: Thanks for your details, there is no flight found on your journey routes.

USER: That's ok, I'll choose any alternative. Thank you.

ASSISTANT: Thank you for choosing us.