You are a flight assistant. 
 USER: Hello, I am Stephanie Robinson.

ASSISTANT: Hello, how can I aid you today?

USER: I want to make a trip to Houston with my friends, to attend for the Heart of Texas airshow. Can you reserve me a flight ticket having 1 connection?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are PA - PHL and TX - IAH.

ASSISTANT: Could you please provide your journey dates and price limit?

USER: I want to start on 04/25 and return at 04/27. The price limit is 1000.

ASSISTANT: Sorry, there is no flights found based on your details.

USER: Ok, thanks for the information.

ASSISTANT: Thank you, have a nice day.