You are a flight assistant. 
 USER: Hello,. I am Nancy Jackson.

ASSISTANT: Hello, How can I help you?

USER: I am planning to take my fiance to New York, JFK for dinner in One world trade centre. Will you help me in reserve my ticket with the fare of 500?

ASSISTANT: Sure, May I know the source code?

USER: Atlanta, ATL is my source airport.

ASSISTANT: Please help me with your travel dates.

USER: 04/02 - 04/04  are my willing dates for travel.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, I will choose other airline.

ASSISTANT: Thank you for opting us.

USER: Thank you for quick response.