You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Denver, please help me in booking a ticket from AUS to DEN.

ASSISTANT: Sure, I am here to help you for this. Could you please share me your travel dates?

USER: My planned travel dates are on Apr 19 and Apr 21.

ASSISTANT: May I know your name please?

USER: My name is Daniel Brown.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: At what time are you planning to depart and return?

USER: I am fine with any timings.

ASSISTANT: Sorry to inform, no flights are found with your specifications.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you very much for approaching our agency.