You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Due to lack of knowledge my brother can not book a flight ticket, so can you please help me to book his flight ticket?

ASSISTANT: Yes, you are in correct place that we can place even advance flight ticket booking also.

USER: Wow! thanks a lot for accepting my request about it.

ASSISTANT: That's fine. For booking your brother ticket, I need some of your brother travelling details, so that I can book his flight ticket. Can you provide it?

USER:  I am happy to share the details about his journey. What details you want for that please let me know so that I can give you?

ASSISTANT: Ok, please provide the dates that your brother prefers to travel.

USER: He want to start his journey on 02/20 and want a return back on 02/22.

ASSISTANT: Ok, please provide the runway codes which is suitable for your brother.

USER: Ok, the runway codes he is preferring to move to DCA from IAH which is our home city.

ASSISTANT: Ok, I will check with the mentioned dates and locations. If there is any flight moving to that region then I will get back and inform you.

USER: Ok, sure go ahead with the checking and inform as soon as possible.

ASSISTANT: On which name would you like me to book the ticket?

USER: I would like to book the ticket in the name of Jack Hill.

ASSISTANT: Jack Hill, all flights are engaged on your requested voyage dates.

USER: I am very disappointed with that, no problem I will choose another alternate way to reach the destination.

ASSISTANT: Sorry for the inconvenience.

USER: It's ok, I really appreciate all the hard work you’ve done to assist me.

ASSISTANT: Thank you for opting us.Have a tremendous day.

USER: I am so thankful for your quick response.