You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am David Smith and I want to book a flight ticket.

ASSISTANT: Sure, may I know your travel details?

USER: I would like to travel from PA-PHL to CA-SFO. My travelling dates are from 10/29 to 10/31.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for your time. There is a Spirit airline with flight number 1028 and price of 100 matching your details.

USER: You can proceed with this airline.

ASSISTANT: Ok, your reservation is done.

USER: Thanks for your service.

ASSISTANT: Thank for choosing us.