You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can assist you today?

USER: I have planned a trip from OAK to EWR, help me in booking my ticket?

ASSISTANT: Sure, I will help you with booking. Can I have your travel dates please?

USER: My preferred dates of travelling are from 06/27 to 06/29.

ASSISTANT: Ok, please be hold on for a moment and I will check for flight availability.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flight is available to you on your dates.

USER: That's fine, I'll choose other option to travel.

ASSISTANT: May I know your good name for documentation purpose?

USER: Myself Margaret Green.

ASSISTANT: Ok, thank you for choosing us. Have a great day.

USER: Thank you for checking.