You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: Can you please help me to search a flight from CA-SFO to DC-IAD?

ASSISTANT: Sure, please provide your journey dates.

USER: The travel dates are 11/11 to 11/13.

ASSISTANT: May I know your name please?

USER: Sure, my name is Andrew Collins.

ASSISTANT: Andrew, no flights has been found on your journey dates.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.