You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to fly from PHL to IAH to meet my parents. Can you please book a direct flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are Mar 09 and Mar 11.

ASSISTANT: Do you have any specifications to be met?

USER: I prefer a return time at afternoon.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Can I have your name to proceed?

USER: I am Charles Johnson.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.