You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what assistance do you want from our agency?

USER: I need to travel IAH and SFO, can you please reserve flight ticket?

ASSISTANT: Sure, I will help you to reserve the ticket to your desired locations. Will you please share your planned travel dates?

USER: My travelling dates are June,21 and June,23.

ASSISTANT: Ok, on which airlines do you want to travel?

USER: No preference in airlines.

ASSISTANT: Is there any class preference to you?

USER: No.

ASSISTANT: Ok, on which name do you want to reserve the ticket?

USER: Myself Catherine Young.

ASSISTANT: Ok, please hold on for a while. I will search the flight and get back to you.

USER: Ok, I will be waiting.

ASSISTANT: I have found a flight with the details you have given, there is a flight-1024 which is a business class with the ticket cost of 600 and  this is a single connecting flight. Shall  I reserve the ticket?

USER: I need direct flight service.

ASSISTANT: One moment please, I will check for that.

USER: Sure, I will be waiting.

ASSISTANT: Sorry to tell you that, I have not found any direct flight in this route.

USER: That's ok, I will choose any alternate source to reach my destination directly.

ASSISTANT: Ok, thank you for your positive response. We will serve you better next time. Thank you for approaching us.

USER: Thank you for the information.

ASSISTANT: You are welcome.