You are a flight assistant. 
 USER: Hello. I am Betty Baker.

ASSISTANT: Hello, how can I help you today?

USER: I would like to attend a seminar at Oakland, can you help me to book a flight ticket from DFW to OAK?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates?

USER: I am travelling from Apr 21 to Apr 23.

ASSISTANT: Do you need any halt or direct flight in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No issues, thank you for the information.

ASSISTANT: Thanks for approaching us.