You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Karen Phillips here, I would like to visit Houston, can you please help me to book a ticket from SFO on 10/28?

ASSISTANT: Sure, may I know the destination airport code please?

USER: Sure, my respective destination airport code is HOU.

ASSISTANT: Do you want any return ticket?

USER: Yes, my return date is on 10/30.

ASSISTANT: Ok, please wait for a while.

USER: Sure, but make sure that the price limit is 200.

ASSISTANT: There is a flight 1007 in Frontier airline has the price 200. Can I proceed with this booking?

USER: Ok, please book it.

ASSISTANT: Your booking is done, have a safe journey.

USER: Thank you for your assistance in reserving my ticket.

ASSISTANT: Thank you for approaching us, have a nice day.