You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, I want to travel on Apr 19 and need to return on Apr 21.

ASSISTANT: Let me know your connection preferences?

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

ASSISTANT: Can I know your name?

USER: I am Jerry Brown.

ASSISTANT: Do you have any requirements?

USER: No.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.