You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I am Jessica White from San Francisco. Can you check the availability of direct flight running in between the points from San Francisco to Oakland?

ASSISTANT: Please provide your travel dates.

USER: My travelling dates are 06/07 to 06/09.

ASSISTANT: Please specify your travel codes.

USER: Sure, my travelling codes are SFO to OAK.

ASSISTANT: No flights found for your travelling dates.

USER: That's Ok, thanks for your help.

ASSISTANT: Thanks.