You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Ruth Roberts. I am planning to visit crafts festival which is going to conduct in Las Vegas, can you please book a flight ticket from Oakland?

ASSISTANT: Sure, we are mirthful to assist you.

USER: Thank you.

ASSISTANT: Could you please share your airport codes?

USER: My airport codes are from OAK to LAS.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: My depart is on May 9th and return on May 11th.

ASSISTANT: Do you need a stopover in between your journey?

USER: No, I need a direct flight.

ASSISTANT: May I know your depart and arrival timings?

USER: The depart time and arrival time should be morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.