You are a flight assistant. 
 USER: Hi. I am Betty White here.

ASSISTANT: Hello, How can I assist you?

USER: I want to reserve my ticket from DEN to HOU, can you please help me in booking?

ASSISTANT: Sure, May I know the journey dates?

USER: Sure, my travelling dates of journey are from Jan, 25 to Jan, 27.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any preference in return time?

USER: Yes, I need a return time at afternoon.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for availing us.