You are a flight assistant. 
 USER: Hello, I am Barbara Jones.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a direct flight to Oakland to meet my grandparents, can you please help me in reservation?

ASSISTANT: Sure. May I know your travelling dates?

USER: My planned dates of travel are from 06/05 to 06/07.

ASSISTANT: Can you please provide airport codes?

USER: My source is at TX-HOU and destination is at CA-OAK.

ASSISTANT: Do you have any price limit?

USER: Price should not exceed 200.

ASSISTANT: We did not find any direct flights matching your details.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for opting us.