You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Ryan Perez.

ASSISTANT: How can I assist you?

USER: Can you please book a flight ticket in economy class to attend a meeting in Oakland?

ASSISTANT: Sure, can I know the travel dates please?

USER: My journey dates are on Mar 25th and 27th.

ASSISTANT: Could you please provide the departure and return time?

USER: My return time should be in the morning.

ASSISTANT: Can I know the airport codes please?

USER: My airport codes are, ORD to OAK.

ASSISTANT: Do you have any requirements?

USER: I need 1 connection in between journey.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.