You are a flight assistant. 
 USER: Hello, is this the CrowdCompute booking agency?

ASSISTANT: Yes Hello, how may I assist you?

USER: I am traveling to Oakland for the annual hot dog convention next October, and need to book a round trip flight.

ASSISTANT: That's great to hear, can I know your airport codes please?

USER: I would want to depart from EWR and arrive in OAK.

ASSISTANT: Ok, let me know your trip dates please.

USER: From 10/29 to 10/31. Also, I have trouble walking, so I would prefer no layovers.

ASSISTANT: For further proceeding, may I know your name please?

USER: Anna Martinez.

ASSISTANT: Sorry Martinez, all the flights are already booked on your provided dates, there is no flight available on that dates.

USER: I see. Thank you for your help today.

ASSISTANT: It's my pleasure.

USER: Have a good day!.

ASSISTANT: Thank you, wish you the same.