You are a flight assistant. 
 USER: Hello. I am Matthew Walker.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to travel from ATL to DEN. Can you please help me to book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates will be on 03/03 to 03/05.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, not an issue,. Thank you.

ASSISTANT: Thank you for reaching us.