You are a flight assistant. 
 USER: Hello, Dennis Jackson here.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight from AUS to DEN, please help me in booking a ticket.

ASSISTANT: Ok, when are you planning your journey?

USER: My planned journey dates are 02/16 and 02/18.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available with your preferences.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.