You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Hill.

ASSISTANT: How may I assist you?

USER: I would like to meet my friend who was staying in Houston, can you help me to make a flight reservation on Apr, 16?

ASSISTANT: Sure, can you please provide me the airport codes?

USER: Currently I am staying in HOU and I have to travel to meet my friend in SFO.

ASSISTANT: Thank you for providing the details, can you please provide me the return date?

USER: I am planning to return back to my city on Apr, 18.

ASSISTANT: Sure, please wait for a movement.

USER: Sure, take your own time.

ASSISTANT: Thank you  for the waiting, AA airlines is providing the flight with price 200 and 1 connections. Shall I confirm your ticket?

USER: yes, it's exactly matched with my criteria, you can proceed with this flight.

ASSISTANT: Sure, your reservation is done with the flight number 1020.

USER: Thank you for your service.

ASSISTANT: Welcome, have a great journey.