You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am David Clark. I want to book a fight ticket to Dallas TX-DFW. Help me in finding a flight from San Francisco CA-SFO.

ASSISTANT: Sure, please share me your travelling dates?

USER: 11/25 is my starting date, my return date will be on 11/27.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights with your specifications.

USER: Its ok, I will search for other alternative.

ASSISTANT: Thank you for reaching us.

USER: Thank you.