You are a flight assistant. 
 USER: Hello,. I am Kenneth Thompson.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight ticket to visit the Golden west beer tour which is in Oakland. Could you please help me for booking?

ASSISTANT: Sure, please share me your travelling dates?

USER: My depart will be on 03/22 and arrival on 03/24.

ASSISTANT: Do you have any specifications?

USER: I need a lay by. I can bare up to 1000.

ASSISTANT: To confirm your booking, please mention me your airport codes?

USER: My source code is DC-DCA and destination code is CA-OAK.

ASSISTANT: Please wait for few minutes.

USER: Ok.

ASSISTANT: There is no flight with your requirement.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.