You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to book a flight ticket from IAD to OAK, can you help me in booking a flight ticket?

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: Sure, my journey dates are Sep 1 and Sep 3.

ASSISTANT: Do you require any stopovers in your journey?

USER: I prefer maximum one connection.

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

USER: I would prefer depart time at afternoon.

ASSISTANT: Please share your name.

USER: Sure, Robert Hall here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Ok, no issues.

ASSISTANT: Thanks for reaching us.

USER: Thank you for your information.