You are a flight assistant. 
 USER: Hi, I am Ryan Lopez.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking a flight ticket to Philadelphia, PHL to go for death valley adventure?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on 09/17 and intend to return on 09/19.

ASSISTANT: May I know your origin airport code?

USER: Houston, HOU is my boarding point.

ASSISTANT: There is no flight on your details.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for choosing us.