You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dennis Miller, I want to book flight from SFO to MSP.

ASSISTANT: Dennis Miller, I am glad you have contacted us. I will help you to book your flight ticket.

USER: My travel dates are 04/20 and 04/22 and I need a halt on my journey.

ASSISTANT: Thank you for the information. Please allow me a moment while I search for the best flight matches your needs.

USER: Ok, take your time.

ASSISTANT: Thank you for your time. May I know if you have any other preferences?

USER: No,thank you for the concern.

ASSISTANT: I see there is a flight-1027 operated by Delta airlines which charges 400. Is it okay for you?

USER: No I can afford only 200.

ASSISTANT: I am sorry to inform you that there are no flights available with 200 fare.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great day.