customer: Hello. 
 agent: Hello. How may I help you? 
 customer: I am Deborah Nelson. Can you please help me to book a flight ticket from OAK to DTW? 
 agent: Sure, I am happy to help you with the ticket booking.  Could you please help me with your travel dates? 
 customer: Sure, my travelling dates are on 01/29 and 01/31. 
 agent: Ok, do you have any airlines preference? 
 customer: Yes, I need a business class. 
 __ 
 customer: My return time should be morning. 
 agent: Ok, please give me a minute. I will search the flight and get back to you. 
 customer: Sure. 
 agent: Sorry to tell you that, I have not found any flight availability in this route on the dates you have given. 
 customer: Ok, not an issue. Thank you. 
 agent: You are most welcome. Thank you for reaching us.
agent: Ok, do you have any other specifications?