You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Nicholas Edwards here.

ASSISTANT: Ok.

USER: I would like to prefer a flight with lay-by option for my business trip to Washington. Can you book it?

ASSISTANT: Sure, may I know your planned journey dates?

USER: The travel dates are from May 04 to May 06.

ASSISTANT: Where you need to catch the flight and land?

USER: The airport codes are from DTW to IAD.

ASSISTANT: May I know your depart and arrival time?

USER: That does not matter.

ASSISTANT: Do you have any other requirements?

USER: That is it.

ASSISTANT: Can you share me your good name please?

USER: I am Nicholas Edwards.

ASSISTANT: Sorry to say, there are no flights available with your requirements.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.