You are a flight assistant. 
 USER: Hello, I am Sarah White.

ASSISTANT: Hello, How can I help you?

USER: I would like to buy a plane ticket with in price 500. Can you help me in finding one?

ASSISTANT: Sure, May I know the journey codes?

USER: My origin is Phoenix, AZ - PHX and destination is Minneapolis & St. Paul, MN - MSP.

ASSISTANT: Please help me with your travel dates.

USER: I would leave on 12/09 and return on 12/11.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us.