You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Johnson here.

ASSISTANT: How can I guide you at this moment?

USER: Actually, I am direct looking for a direct flight because of some urgency, can you please help me out with booking of a flight ticket between Minneapolis and Houston?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Thank you for accepting my request. My departure is on 01/21 and please book my return ticket also on 01/23.

ASSISTANT: May I know your nearest airport codes of journey please?

USER: Sure, I will prefer MSP and IAH as my origin and destination airport codes respectively because those airport codes are near and convenient for me to travel.

ASSISTANT: Wait a moment please.

USER: Ok, take your time but try to bring a best flight in my route.

ASSISTANT: Sarah Johnson, there is no flight services available on this route with your requirement of direct flight.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for contacting us.