You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Perez.

ASSISTANT: How may I help you?

USER: I want to book a ticket from LAS to DEN, will you help me to book a ticket?

ASSISTANT: Sure, may I know your departure and arrival dates?

USER: My travelling dates are on Aug 04 and Aug 06.

ASSISTANT: Can you please provide me your airline preferences?

USER: I am okay with any airline.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need single connection.

ASSISTANT: Do you have any specifications?

USER: My depart time is morning.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.