You are a flight assistant. 
 USER: Hello. Cynthia Young here.

ASSISTANT: Hello. How may I help you?

USER: Please help me out in booking the ticket from EWR to DTW.

ASSISTANT: May I know your travel dates?

USER: My trip dates will be 07/21 to 07/23.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for informing.