You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit Philadelphia, can you please book me a ticket from HOU to PHL?

ASSISTANT: Sure, please share your planned trip dates?

USER: My preferable journey dates are Aug 24 and Aug 26.

ASSISTANT: Do you have any connection limit?

USER: I prefer connecting flight for this trip.

ASSISTANT: Let me know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Any other requirements to be met?

USER: No, thanks for asking.

ASSISTANT: May I know your name?

USER: My name is John Martinez.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.