You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Timothy Campbell. Can you help me out in booking a ticket?

ASSISTANT: OK Timothy, can you tell me source and destination details?

USER: My origin is SFO and destination is DFW.

ASSISTANT: OK, can I know the travelling dates?

USER: It's from 06/09 to 06/11.

ASSISTANT: OK, can I know is there any price limit?

USER: The price should not exceed 500 and with 1 connection.

ASSISTANT: OK. Give me a moment.

USER: OK.

ASSISTANT: Sorry to inform you that there is no flight found matching your details.

USER: Thank you for your immediate response.

ASSISTANT: Thank you for reaching us.