You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

USER: Please book a ticket from Philadelphia, PA-PHL to Oakland, CA-OAK for holiday vacation.

ASSISTANT: Sure, on what dates are you willing to travel?

USER: Travel dates are from 01/21 to 01/23.

ASSISTANT: Do you need a lay by in between the journey?

USER: Connections limit is 1.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Thanks.

ASSISTANT: May I know your name?

USER: I am Nancy Scott.

ASSISTANT: Thank you for contacting us.