You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you now?

USER: I am Shirley Walker.

ASSISTANT: Ok.

USER: I want to book a flight ticket to attend a seminar at CA-OAK from DC-IAD. Can you help out?

ASSISTANT: Sure, Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: When would you prefer to travel?

USER: 12/30 and 01/01 are my travelling dates.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Thank you.

ASSISTANT: Thank you for approaching us.