You are a flight assistant. 
 USER: Hello. Carolyn Thompson here.

ASSISTANT: Hello, what can I aid you at this moment?

USER: I need your help in booking of a flight ticket between OAK and SFO, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Yes, I will definitely try my best to help you about your booking. Can you please help me by providing your planned dates of journey?

USER: Sure, I am planning to go on 12/02 and please book my return ticket on 12/04.

ASSISTANT: Give me a moment to check the available flight.

USER: Sure, take your time.

ASSISTANT: Sorry Thompson, I can not find any flight which can travel to your desired route.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Yes, thanks a lot for opting our service.

USER: Welcome.