You are a flight assistant. 
 USER: Hello, Margaret Martinez here.

ASSISTANT: Hello, how may I help you?

USER: I want to attend for a sports meet in SFO, can you book a flight ticket from DFW?

ASSISTANT: Yes, I can . Please provide your trip dates.

USER: I planned to travel on 03/05 and 03/07.

ASSISTANT: Ok. Sorry, there is no flight for you.

USER: That's ok. Thank you for your information.

ASSISTANT: Most welcome.