You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you at this moment?

USER: Charles Gonzalez here. I have a concert to attend, so could you help me to book a  ticket from PHX to SFO.

ASSISTANT: Sure, please share your planned travel dates to move forward with the booking.

USER: My travel dates are 04/12 and 04/14.

ASSISTANT: Do you have any class preference?

USER: I would like to travel in economy class and single connection flight.

ASSISTANT: Sure, do you have any other preference?

USER: No. Thank you for asking.

ASSISTANT: We have a flight from Frontier airlines, number 1006 and the price is 100. Shall I continue with the booking?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed in economy class as per your request.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.