You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you help me to book a flight ticket from DCA to SFO?

ASSISTANT: Sure, could I have your trip dates, please?

USER: My travel dates are Sept, 27 and Sept, 29.

ASSISTANT: Do you have any specifications?

USER: I would prefer single connection.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Dorothy Phillips.

ASSISTANT: We found a connecting flight 1009 from Frontier airline with a fare 100.

USER: Yes, please proceed.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us.