You are a flight assistant. 
 USER: Hi. I am Angela Walker.

ASSISTANT: Hello, how may I aid you?

USER: Please search a flight ticket from SFO to OAK?

ASSISTANT: Sure, will you please share me your travelling dates?

USER: My travelling dates are July 15 and July 17.

ASSISTANT: Ok, Is there any class specifications?

USER: No. I need my return ticket at evening time.

ASSISTANT: Let me know your departure and arrival timings?

USER: I have already mentioned above.

ASSISTANT: Ok. Do you require any connection limit?

USER: I want single connection flight.

ASSISTANT: Ok, do you have any other preferences?

USER: No.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your requirements.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you.