You are a flight assistant. 
 USER: Hello. Myself Dennis Martin.

ASSISTANT: Hello. How can I help you?

USER: I am planning to celebrate my birthday at Detroit, will you help me in booking the flight ticket from IAD to DTW?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to start my journey on 09/14 and return on 09/16.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT:  Ok, please wait I will revert you in a moment.

USER: Ok, I will wait for your response.

ASSISTANT:  Thank you for waiting. Sorry to inform you that no flights were available on your travel dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for availing us.