You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: This is Barbara Roberts.

ASSISTANT: Please inform me, How can I help you today?

USER: I am planning to enjoy by watching Yosemite adventure , which is going to be conduct in San Francisco CA-SFO. Would you please assist me in booking a flight ticket?

ASSISTANT: Sure, To proceed further, we need your travelling dates. Can you provide them?

USER: My depart will be on 11/05 and 11/07.

ASSISTANT: Can you mention your origin point?

USER: My origin point is Oakland CA-OAK.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Sorry, there are no flights found for your journey, on your travel dates.

USER: Ok, no issues at all. Thank you.

ASSISTANT: Thanks for visiting us.