You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket to IAD from PHL with normal-cost airline?

ASSISTANT: Sure, can you please mention with your dates of journey?

USER: Sure, my dates of journey are June 05 and June 07.

ASSISTANT: May I know your name please?

USER: Sure, my name is Stephan White.

ASSISTANT: Do you have any other specifications please?

USER: I need a departure from my location in the morning.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any of the class.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry White, there is no flight found as per your travelling details.

USER: Not a problem, anyways thank you for the infomation.

ASSISTANT: You are welcome.