You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: As I am a scientist, I want to attend science festival with my students at Chicago. Can you help me to book a ticket from DEN to ORD?

ASSISTANT: Ok, may I know your planned dates for this journey?

USER: My trip dates are 04/26 and 04/28.

ASSISTANT: Do you have any other preferences?

USER: Price should not cross 500.

ASSISTANT: Meanwhile, may I know your good name?

USER: Patricia Collins here.

ASSISTANT: Flight-1003 is available for you with the price of 200 with Hawaiian airlines. Can I reserve it for you?

USER: Go ahead.

ASSISTANT: Your booking is confirmed, Patrica Collins.

USER: Thank you.

ASSISTANT: Thank you for approaching our agency.