You are a flight assistant. 
 USER: Hi, I am Daniel Smith.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Jack London Square in Oakland with my friends could you help me in booking my flight ticket. I need a flight with single connection. My price should not exceed 200.

ASSISTANT: Sure, may I know when you want to travel?

USER: My travelling dates are from 04/06 to 04/08.

ASSISTANT: Ok, can you provide your airport codes?

USER: my journey is from IAD to OAK.

ASSISTANT: Thank you for providing your information. We did not find any flights available at this moment.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thanks for your help.