You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to attend my brother wedding anniversary.

ASSISTANT: May I know your travelling details?

USER: Can you help me in booking a flight ticket? My travelling dates are 07/30 and 08/01.

ASSISTANT: May I know your source and destination?

USER: My source is MN - MSP and destination is CA - SFO.

ASSISTANT: Please give me a second.

USER: Ok.

ASSISTANT: May I know your name for the documentation purpose.

USER: I'm Patrick Hill.

ASSISTANT: Sorry Patrick, there are no flights as per your requirements.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.