You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for today?

USER: I want to book a flight ticket from PA to attend a robotic workshop in TX, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am here to help you about that. Can you please provide your planned dates of journey?

USER: Sure, I intend to start my journey on 05/15 and my return date will be on 05/17.

ASSISTANT: Please provide your nearest airport codes of journey.

USER: My source airport code is PHL and my destination airport code is IAH.

ASSISTANT: Can you please provide your name for booking purpose?

USER: I am Carol Evans.

ASSISTANT: Do you have any other requirement for your journey?

USER: I need to depart in the afternoon.

ASSISTANT: Sorry to say this Carol Evans, there are no flights which travels to your region.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: You are welcome, thank you for reaching us.