You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: David Perez here.

ASSISTANT: What type of service you are expecting from us?

USER: I am looking for a flight ticket with class preference as economy. So can you book it?

ASSISTANT: Ok, I will definitely help you. When you are willing to travel?

USER: The travel dates are from 21 Nov to 23 Nov.

ASSISTANT: Ok, may I know your airport codes?

USER: Yes, the airport codes are from SFO to HOU.

ASSISTANT: The AA airlines are having a connection limit 1 and the ticket fare is 1022. Can I proceed with the ticket booking?

USER: I am fine with the airlines and fare. You can book it.

ASSISTANT: Your ticket is confirmed in a economy class and the flight number 1022.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a happy journey.