You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Gregory Brown.

ASSISTANT: Yes Brown.

USER: I need to book a flight ticket with single connection, Can you please help me that?

ASSISTANT: Sure Brown, I am here to help you, can you please provide me your travelling dates?

USER: I would like to travel on 01/27 to 01/29.

ASSISTANT: Ok, may I know your airport codes?

USER: Source point is CA-SFO to TX-IAH.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry Brown, there is no flight is available for your request.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Welcome. Thank you for choosing us.