You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Welcome to airline booking agency. How can I be a helping hand to you?

USER: One of my friend is unable to book his ticket from past two days, so I have reached your service to book his ticket, can you please help in that booking?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thanks.

ASSISTANT: Will you please provide your friend's name to book the flight ticket?

USER: My friend's name is Nicholas Young.

ASSISTANT: Oh which dates he want's to travel?

USER: Sure, they planned on 09/06 and back on 09/08.

ASSISTANT: Will you please provide your friend's airport codes?

USER: Sure, my friend want's to travel from Oakland-OAK airport to Detroit-DTW airport.

ASSISTANT: Ok, please hold on a moment to check the flights availability and I will revert back to you.

USER: Sure.

ASSISTANT: Based on your information, I have found a flight with 1 connection with the fare of 600 is available for you. Shall I proceed with this?

USER: Can you please check the fare with 200?

ASSISTANT: Ok, please wait to check.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights found with in that price range to your travel locations.

USER: Ok, that's fine, no problem.

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

USER: Thank you for your service.

ASSISTANT: Welcome.