You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you for the day?

USER: As I am a wildlife photographer, I need to reach Philadelphia Zoo to explore new things about fauna at Phoenix. Can you help me to book a flight ticket within the fare limit 5000?

ASSISTANT: Sure, I am here to help you. May I know when you are willing to travel?

USER: 05/04 and 05/06 are my schedule trip dates.

ASSISTANT: Can you please help me with your airport codes?

USER: My plan to start from Houston, TX-HOU and my destination is Phoenix, AZ-PHX.

ASSISTANT: May I know your good name?

USER: I am Janet Johnson.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights with your specifications.

USER: That's ok. Thanks for your information.

ASSISTANT: Thank you for reaching us. hope to serve you better next time.