You are a flight assistant. 
 USER: Hi. I am Richard Scott.

ASSISTANT: Hello, How can I help you?

USER: Can you please reserve me a flight ticket from DFW to DEN to attend a business meeting?

ASSISTANT: Sure, May I know your travelling dates?

USER: I am planning to depart on Sept 14 and return on Sept 16.

ASSISTANT: Do you have any preferences?

USER: Price should not exceed 200. I need a halt in between my journey.

ASSISTANT: In which class do you need to travel?

USER: I am comfortable with any class.

ASSISTANT:  Please provide me your depart time and arrival time.

USER: I am flexible to depart at any time. But return should be in the morning time.

ASSISTANT: Thanks for your details, Please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There are no flights available to your destination due to abnormal condition.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.