You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you for today?

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

ASSISTANT: Sure, I am blissful to assist you. Can you please let me know your dates of journey?

USER: The travelling dates are 02/21 to 02/23.

ASSISTANT: Can you please let me know your name for further proceedings?

USER: Sure, my name is Shirley Mitchell.

ASSISTANT: Sorry Mitchell, there is no flights on your preferable dates of journey.

USER: Ok, no problem.

ASSISTANT: Ok, thank you for reaching out here.

USER: Thank you for your information.