You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from SFO to PHL, can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your planned trip dates?

USER: Sure, my scheduled dates are Apr 21 and Apr 23.

ASSISTANT: Do you have any connection limit?

USER: I prefer maximum one connection.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, Debra Perez here.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.