You are a flight assistant. 
 USER: Hi, I am Michelle Wright.

ASSISTANT: Hello, How can I help you?

USER: I want to schedule my trip on dates from 02/23 to 02/25 as I have an appointment with my doctor. Can you help me in booking?

ASSISTANT: Surely, Please help me with your journey codes.

USER: My boarding point is CA - SFO and landing point is AZ - PHX.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for choosing us.

USER: Its Ok. Thanks for your response.