You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

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

ASSISTANT: Yes, I will definitely try my best to help you in booking your flight ticket. Could you please provide your planned dates of journey?

USER: My travel dates are Feb 27 and Feb 29.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a flight with single connection.

ASSISTANT: Would you let us know if you have any other preferences?

USER: No, thank you for asking.

ASSISTANT: Please share your name.

USER: Myself Lisa Davis.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, not an issue.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your information.