You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are Aug, 1 and Aug, 3.

ASSISTANT: Is there any specification?

USER: I need to depart at morning time.

ASSISTANT: Is there connection specification?

USER: I need connecting flight.

ASSISTANT: Can I know your name?

USER: Christopher Clark here.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you.