You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in booking a flight ticket to PHX from OAK?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My travel dates are from Apr 28 to Apr 30.

ASSISTANT: May I know your name please?

USER: I am Elizabeth Nelson.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I would like to travel in economy class.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.