You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am looking for a flight from SFO to PHL, can you please help me in booking?

ASSISTANT: Yes, I can help you and will you please provide your journey dates?

USER: My travelling dates are Aug 02 and Aug 04.

ASSISTANT: Can I have your limit specifications?

USER: I need a direct flight.

ASSISTANT: Are you ok with economy class or do you need a business class flight?

USER: I am fine with any class.

ASSISTANT: Can I know your name for reference purpose?

USER: Sure, my name is Micheal Miller.

ASSISTANT: Please be on hold for a moment.

USER: Sure.

ASSISTANT: No flights are moving towards your locations due to sold out of tickets.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for utilising our service and have a great day.