You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Miller.

ASSISTANT: How may I help you today?

USER: I am planning to visit Chicago city, I am trying to make a reservation from Oakland. Can you please help me with that?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates should be 01/25 and 01/27.

ASSISTANT: Ok, may I know your airport codes?

USER: The preferred airport codes are OAK and ORD.

ASSISTANT: One of the best airline UA is providing the service having a connection limit 1. Can I proceed?

USER: I am happy with this airlines, you can proceed to book the flight ticket.

ASSISTANT: Yes Miller, your ticket is confirmed with the flight number 1008.

USER: Thanks a lot for helping me in booking a flight ticket.

ASSISTANT: Thank you for approaching us, have a safe journey.

USER: Welcome.