You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I serve you today?

USER: I am Helen Hall, help me to book a flight on 03/24 to meet my friend. Can you book a return ticket on 03/26 from St.Paul?

ASSISTANT: Sure, may I know your airport codes?

USER: I will fly from AZ-PHX to MN-MSP.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there is no flight to your destination point.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.