You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Smith here.

ASSISTANT: How may I assist you?

USER: I need to attend a business meeting at Minneapolis, can you please book a flight ticket from PHX to MSP?

ASSISTANT: Sure, may I know your travelling dates please?

USER: Sure, my travelling dates are from 07/26 to 07/28.

ASSISTANT: Wait for a while please.

USER: Ok, take your time.

ASSISTANT: Karen Smith, there are no flights available in your route.

USER: That's ok, no problem. Anyway thank you for the information.

ASSISTANT: Thank you for approaching us.