You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I help you?

USER: I want to book a flight ticket to attend my sister's marriage at TX-DFW from CA-OAK.

ASSISTANT: Please provide your travelling dates?

USER: 07/09 and 07/11 are my travelling dates.

ASSISTANT: Any specifications?

USER: I need a direct flight.

ASSISTANT: No flight found as per your requirement.

USER: No issue.

ASSISTANT: Please provide your name?

USER: I am Robert Collins.

ASSISTANT: Thanks.