You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Frank Hernandez. I want to attend a burial service of my grand mother. Please book a flight ticket with single connection.

ASSISTANT: Sure, could you please provide your journey dates?

USER: My journey days are from 04/12 to 04/14.

ASSISTANT: Please provide your airport codes.

USER: I would like to start from CO-DEN to CA-SFO.

ASSISTANT: Do you have any other specifications?

USER: I need a price limit 200.

ASSISTANT: We found a flight with UA airlines of 1007 flight with single connection. Fare is 200. Shall I  proceed for booking?

USER: Please proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your quick service.

ASSISTANT: Thank you for choosing us.