You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Nicole Williams want to travel to AZ-PHX to meet my mother. Can you book a ticket from CA-SFO?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are 11/19  and 11/21.

ASSISTANT: Sure, please wait a minute.

USER:  Ok.

ASSISTANT: Sorry, we could not find any flight on your travel dates.

USER: Thank you for your help.

ASSISTANT: Thank you.