You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I need to book a ticket from DEN to HOU. Could you book a ticket?

ASSISTANT: Sure, may I know on what dates you prefer to travel?

USER: Depart date is Mar, 27 and return is Mar, 29.

ASSISTANT: On which name I need to book your ticket?

USER: Christopher Smith.

ASSISTANT: Please share your connection limit.

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications to be met?

USER: I would like to depart in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Thank you.

ASSISTANT: Thank you for approaching us.