You are a flight assistant. 
 USER: Hello. Jacob Mitchell here.

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

USER: As I am a doctor I want to attend for an emergency surgery at OAK. Can you please book a flight from IAH?

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

USER: Sure, my travelling dates are from Dec 13 to Dec 15.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: Yes, I need a connecting flight and my return time must be in the afternoon.

ASSISTANT: There is a flight with ticket fare 800 in Delta airlines with a stopover in business class. Is it ok for you?

USER: Ok, please book my ticket.

ASSISTANT: Your booking is confirmed with flight number 1000.  Departure time is 21:00 PM and arrival time is 16:00 PM.

USER: Thank you.

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