You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Anderson.

ASSISTANT: How may I help you today?

USER: Can you help me in booking from IAD to DTW?

ASSISTANT: Ok, may I know your travelling dates?

USER: My journey dates are 11/10 to 11/12.

ASSISTANT: Sandra Anderson, please wait for a moment. Sorry to inform you, there are no flights available as per your request.

USER: That's ok, thank you for checking.

ASSISTANT: Sorry for the inconvenience. Have a great day ahead.