You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is George Baker. I am planning to travel visit San Francisco, can you help me for booking a flight ticket?

ASSISTANT: Yes, I can help you. Can you tell me your travelling dates?

USER: My planning dates are from 06/30 and 07/02.

ASSISTANT: Ok, could you share me your nearest airport codes?

USER: My source airport code is DFW and destination airport code is SFO.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for consulting our agency.

USER: Welcome.