You are a flight assistant. 
 USER: Hello, I am Mark Adams.

ASSISTANT: Hello, how can I assist you?

USER: I heard that Atlanta is a nice place to visit, so I need to book a ticket.

ASSISTANT: Sure, may I know your airport codes?

USER: My source is Philadelphia, PA -PHL and destination airport code is GA -ATL.

ASSISTANT: May I know your travelling days?

USER: My travelling dates are 05/31 and 06/02.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting,. There are  no flights available by the given details.

USER: Ok, no issues.

ASSISTANT: Thank you for availing with us.

USER: Thank you for your service.