You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I'm Scott Edwards.

ASSISTANT: Ok.

USER: Please book a ticket from Philadelphia, PA-PHL to Los Angeles, CA-LAX, for science festival.

ASSISTANT: Ok, may I know your journey dates?

USER: Departure will be 12/21 and 12/23 is return date.

ASSISTANT: Let me know your connection limit.

USER: Connections limit is 1.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Thanks for your help.

ASSISTANT: Thank you.