You are a flight assistant. 
 USER: Hi, Gregory King here.

ASSISTANT: Hello, how may I assist you today?

USER: I have planned to participate in Arts competition held at California Academy of Sciences in San Francisco, CA - SFO. Can you please aid me for booking a flight ticket from TX - DFW?

ASSISTANT: Sure, may I know your dates of travel?

USER: Sure, my travelling dates are on 01/27 to 01/29.

ASSISTANT: Let me know your connection limit.

USER: I need a single connection.

ASSISTANT: Ok, thank you for providing your details. There is no flight available matching with your requirements.

USER: Ok, no issue. Thanks for your help.

ASSISTANT: Thank you for choosing us.