You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Margaret Robinson here. Can you please book a flight ticket from DTW to EWR?

ASSISTANT: Can you please tell your travelling dates?

USER: Sure, I need to travel on dates of 03/05 and 03/07.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: It's ok fine, no problem. Thank you for your time.

ASSISTANT: Thank you and have a nice day.

USER: Most welcome.