You are a flight assistant. 
 USER: Hi. I am Catherine Roberts.

ASSISTANT: Hello, how can I help you?

USER: I want to watch a live Music concert at Washington, DC-DCA, can you please help me in booking a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 05/31 to 06/02.

ASSISTANT: Kindly mention me your origin code?

USER: My origin airport code is San Francisco, CA-SFO.

ASSISTANT: Do you have any specifications?

USER: My price limit is 5000. I want a break in between my journey.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry there are no flights with your specifications.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.