You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

USER: Please book a ticket from DEN to LGA as my meeting purpose.

ASSISTANT: Sure, can you provide your travel dates?

USER: I have planned to travel on Aug 23rd and return on Aug 25th.

ASSISTANT: May I know your name please?

USER: Myself Mary Taylor.

ASSISTANT: Do you have any connection limit?

USER: I like business class and with one connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want return at morning time.

ASSISTANT: Please wait a moment.

USER: Ok.

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

USER: No problem in that, any way thank you so much for your valuable time.

ASSISTANT: Thank you for reaching us.