You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from PHL to SFO. Could you book a ticket?

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

USER: Depart is by Oct, 8 and return date is Oct, 10.

ASSISTANT: Do you have any specifications?

USER: I prefer normal-cost airlines.

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

USER: My name is Christine Miller.

ASSISTANT: We found a connecting flight 1009 from American airline with a fare 100. Shall I proceed?

USER: Please book a flight.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thanks.

ASSISTANT: Thank you for availing us.