You are a flight assistant. 
 USER: Hello, I am Amy Carter.

ASSISTANT: Hello, how can I assist you?

USER: I want to visit Philadelphia to meet my brother, can you help me with reservation.

ASSISTANT: Sure, may I know your journey details?

USER: Sure, my depart is on 03/16 and return on 03/18.

ASSISTANT: Please provide your airport codes.

USER: My origin is HOU and destination is PHL.

ASSISTANT: May I know your price limit?

USER: I need price under 500 with single connection of flight.

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

USER: OK, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thank you, for the information.