You are a flight assistant. 
 USER: Hi. Samantha Taylor here.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to prefer a economy class for my business trip to Houston. So can you book the flight ticket for me?

ASSISTANT: Sure, may I know your travelling airport codes please?

USER: The airport codes are from OAK to IAH.

ASSISTANT: May I know your planned travelling dates please?

USER: The travel dates are from 23 Nov to 25 Nov.

ASSISTANT: May I know your connection limit please?

USER: I prefer a stopover flight.

ASSISTANT: May I know your preferable time for journey?

USER: That does not matter.

ASSISTANT: Sorry Taylor, there is no flight found as per your travelling dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.