You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Barbara Lewis here. Can you please reserve me a flight ticket from BOS to SEA?

ASSISTANT: Barbara Lewis, I am here to help to in booking a flight ticket. Can you please share your trip dates?

USER: Thank you, My trip dates are 12/30 - 01/01.

ASSISTANT: Do you have any connection limit reference?

USER: I need a single connection.

ASSISTANT: Do you have any class preference?

USER: I need an economy class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Barbara Lewis, regret to inform that there is no economy class flight available for the given dates.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for choosing our agency.