You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am David Roberts. I want to attend an event which is conducted for special children at Dallas and Fort Worth. Can you help me in my booking?

ASSISTANT: OK David, I will help you out in booking.

USER: Thank you.

ASSISTANT: Can you please provide me your travelling dates?

USER: My journey dates are from 09/13 to 09/15.

ASSISTANT: May I know on which airport codes you want to travel?

USER: My airport codes are from OAK to DFW.

ASSISTANT: Ok, please wait a moment.

USER: I can bare up to 200. Sure, take your time.

ASSISTANT: Sorry David, there are no flights found with these dates.

USER: Not an issue. Thank you for your information.

ASSISTANT: Ok, thank you for approaching us.