You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: Samuel Perez here.

ASSISTANT: Ok.

USER: I need a direct flight to Philadelphia as I have an urgent surgery, so please help me with booking a flight ticket.

ASSISTANT: Sure, we are here to make your work ease.

USER: Ok.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I need to go on 05/24 and return back on 05/26.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: I will board at LAS and land at PHL.

ASSISTANT: Do you need a way station in between your journey?

USER: I need a direct flight as I have already said.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.