You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket from DTW to IAD, will you please help me to make a reservation?

ASSISTANT: Sure, can I know your name please to proceed further?

USER: Sure, I am Sarah Smith.

ASSISTANT: Can I know the travel dates please?

USER: My travelling dates are on Sept 18 and Sept 20.

ASSISTANT: Could you please provide the departure and return time?

USER: I am comfortable to travel at any time.

ASSISTANT: Do you have any requirements?

USER: I would like to travel in normal cost airline.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.