You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I have a plan to visit Philadelphia. Can you please help me in booking flight ticket from DFW to PHL?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Do you have any class preference?

USER: No, thanks for asking.

ASSISTANT: Could I have your journey dates, please?

USER: My trip dates are July 07 to July 09.

ASSISTANT: In which airline, are you comfortable to travel?

USER: I need to travel with normal cost airline as they provide good service.

ASSISTANT: Is there any other preference, do you require?

USER: No.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for your precious time. Sorry, there are no flights available on your scheduled dates.

USER: Ok, no problem. Thank you.

ASSISTANT: For documentation purpose, may I know your good name?

USER: Myself Jason Turner.

ASSISTANT: Thank you, have a good day.