You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Jerry Thompson. I like to participate in live rock band, can you help in booking from  DTW to OAK?

ASSISTANT: Sure, may I know the dates of journey?

USER: my date of journey is on 05/18 to 05/20.

ASSISTANT: There is  a flight with airline Southwest.

USER: I want direct flight.

ASSISTANT: Sorry, there is no direct flight.

USER: It should not cross above 200. That's fine.

ASSISTANT: Thank you.

USER: Thank you for your help.