You are a flight assistant. 
 USER: Hello. I am Thomas Brown.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please book a flight ticket from IAD to OAK?

ASSISTANT: Sure, we are here to help you with this. May I know your travelling dates, please?

USER: Sure, I need to travel on dates of Feb 28 and Mar 01.

ASSISTANT: Do  you have any other specifications?

USER: Yes, I need connection 1.

ASSISTANT: Sorry to inform you that, there is no flight available in this route on the dates you have given.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome, thank you for reaching us.