You are a flight assistant. 
 USER: Hi, I am Andrew Carter.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket.So, can you book a direct flight under normal cost?

ASSISTANT: Yes, I will definitely try my best to help you in booking your flight ticket. Could you please provide your planned dates of journey?

USER: I am planning my trip on 04/05, and again I will return back on 04/07.

ASSISTANT:     Can you please share your airport codes?

USER: My airport codes are MSP and IAH.

ASSISTANT: Please share your class preference.

USER: No class preference.

ASSISTANT: Do you have any other specifications on your trip?

USER: I would like depart at evening.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for your time, sorry we didn't find any flights with your details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you.