You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Thomas here.

ASSISTANT: In which way I can help you today?

USER: Me and my friend were planned a trip to San Francisco. The ticket is confirmed for my friend but due to some technical issues my ticket is not yet confirmed, so can you reserve a flight ticket again to me?

ASSISTANT: Sure, I will help you in booking flight ticket. Could you please mention your travel dates for booking flight ticket?

USER: Thank you. I am planning to move on 12/02 and please book my return ticket on 12/04.

ASSISTANT: May I know your preferable airport code names for further process?

USER: I will prefer HOU and SFO as my origin and destination airport codes for booking?

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Ok, take your time to check but try to bring a best flight in my route.

ASSISTANT: Based on your information, UA airline is ready to serve you with 1 connection with a minimum fare of 200 is available for you. Shall I proceed with this?

USER: That's fine for me, you can proceed with booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1009.

USER: Thank you for your help in booking of my ticket.

ASSISTANT: You are welcome.