You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from DTW to BOS?

ASSISTANT: Sure, Can I know your travelling dates?

USER: I want to fly on April 05 and return on April 07.

ASSISTANT: Do you have any specifications?

USER: I need a halt in between my journey. Make sure that depart time is in afternoon.

ASSISTANT: Do you have any cost preference?

USER: I would like to prefer normal cost.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: There are no flights available on your travel dates.

USER: Not an issue. Thank you.

ASSISTANT: May I know your name for documentation?

USER: I am Patrick Martin.

ASSISTANT: Thank you for reaching us.

USER: Thank you.