You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Helen Young. I am planning to travel from AUS to OAK to attend a business meeting.Can you help me out to book a flight ticket?

ASSISTANT: Sure Young, I will help you. Please share your exact dates of journey?

USER: Sure, I would like to fly on 11/30 and return date is 12/02.

ASSISTANT: Ok, give me a moment, I will search an appropriate flight for you to travel.

USER: Make sure, my connection limit is 1. Ok, take your own time, but try to find a best flight for me.

ASSISTANT: Sorry Young, all flights are booked in this winter. Would you like to travel on any other dates?

USER: That's really sad to hear. No, I don't have any other dates.

ASSISTANT: Ok.

USER: Thank you for your service.

ASSISTANT: Welcome. Thank you for approaching us.