You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from DTW to JFK?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Thank you. I have planned my travel dates as Apr 03 and Apr 06.

ASSISTANT: Can you please tell me your name?

USER: Sure, myself Sarah Smith.

ASSISTANT: Do you have any specification?

USER: I would like to return in morning time so please make sure that.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you.

USER: Most welcome.