You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Washington, will you help me in booking the flight ticket from OAK to IAD?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My preferable journey dates are Sept 09 and Sept 11.

ASSISTANT: Do you have any preferences?

USER: I need a flight with single connection.

ASSISTANT: Give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, not an issue.

ASSISTANT: Can I know your name?

USER: Myself Daniel Campbell.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.