You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Mark Roberts, can you please help me to book my flight ticket to AUS from DEN in the month of December?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for considering my request.

ASSISTANT: When you are willing to travel?

USER: I am willing to travel from 12/21 to 12/23.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a single connecting flight for my journey.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: Not an issue with that, I will go with another resources to reach out my destination. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us.