You are a flight assistant. 
 USER: Hello. I am Gary Hall.

ASSISTANT: Hello, how can I guide you for today?

USER: I would like to book a ticket to Oakland, can you please help me out?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I am travelling on these dates 01/12 and 01/14.

ASSISTANT: May I know your source and destination airport codes?

USER: I am flying from HOU to OAK.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure.

ASSISTANT: Here is a flight with ticket fare 400 in AA airlines with a stopover. Is it ok for you?

USER: Please check with price limit 200.

ASSISTANT: Sorry, there is no flights available with your requested price on this route.

USER: Ok no problem, thank you for your services.