You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Hall here.

ASSISTANT: How can I aid you?

USER: Can you please make a reservation from ATL to DEN to meet my grandparents in Denver?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: On what dates you want me to make the reservation?

USER: My departure is on Sept 11 and please book my return ticket on Sept 13.

ASSISTANT: Do you need a connecting flight or direct flight?

USER: I will prefer connecting flight for my journey.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: I would like to return in morning time.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.