You are a flight assistant. 
 USER: Hello. I am Helen Martin.

ASSISTANT: Hello, How can I help you?

USER: I want to travel from PHX to MSP. Can you book a flight ticket for me?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I want to travel in the flight on 08/01 and 08/03.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for opting us.