You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Evans.

ASSISTANT: Evans, how can I assist you?

USER: I need to reach Stone Arch Bridge where I need to solve leakage problem in Minneapolis. Can you please book a flight ticket from OAK to MSP?

ASSISTANT: Sure, I can book your ticket. Please provide your journey dates.

USER: Sure, my travel dates are 08/12 and 08/14.

ASSISTANT: Let me check. Sorry, no flight's found. Would you like to travel on some other day?

USER: It is sad to hear.

ASSISTANT: I am sorry.

USER: I did not planned right now. Thank you for your time.

ASSISTANT: Thank you for reaching us.