You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: This is Gary Wright, can you help me to book a flight ticket from ATL to DEN?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please help me with your journey dates?

USER: I am travelling from June 16 to June 18.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Thanks for your details, please wait.

USER: Sure, Please ensure that book a return flight ticket at morning time.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: No problem ,thank you for the information.

ASSISTANT: Thank you for choosing us.