You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Virginia Moore.

ASSISTANT: How can I help you?

USER: I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from LGA to DEN?

ASSISTANT: Let me know your travelling dates.

USER: I would like to depart on July 29th and return on July 31st.

ASSISTANT: Do you have any preference?

USER: I am looking for a connecting flight.

ASSISTANT: Found ticket with airline Frontier for price 200 having flight number 1028.

USER: But, I need to return in the morning.

ASSISTANT: Sorry, no flights found.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you.