You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am kevin Walker and I want to book a flight ticket to attend a board meeting at NY-LGA on 12/27.

ASSISTANT: From where you plan to travel?

USER: I would like board at CA-SFO.

ASSISTANT: When do you want to return.

USER: 12/29 is my return date.

ASSISTANT: Do you have any price limit?

USER: I need a flight ticket under 200.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for being patient. We found a airline matching your request. Southwest airline, flight number 1009 and price is 200.

USER: You can proceed booking with this airline.

ASSISTANT: Your booking is done.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.