You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I need to travel PHL and OAK, can you please reserve flight ticket?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are Apr,04 and Apr,06.

ASSISTANT: Ok, may I know your name to book a flight ticket?

USER: Myself Justin Martin.

ASSISTANT: Do you have any connection preference?

USER: Yes, I prefer one connecting flight.

ASSISTANT: Any more specifications do you have?

USER: No.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your requested dates of travelling.

USER: That's ok, I will choose any alternate source to reach my destination. Thank you.

ASSISTANT: Thank you for contacting us, hope you have a great day.