You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please help me to book a flight from IAD to SEA?

ASSISTANT: Sure, May I know the travelling dates?

USER: Sure, I want to travel on Apr 1 and need to return on Apr 3.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Is there any other requirements?

USER: I prefer an normal-cost airline to travel.

ASSISTANT: May I know your name?

USER: I am Debra Baker.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for opting us.