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

ASSISTANT: Hello, how can I help you today?

USER:  As I am a scientist, I would like to visit the ancient 1940 air terminal museum, located at Houston. Can you please help me in booking?

ASSISTANT: Sure, please help me with your travelling airport codes?

USER: My source is at  PA-PHL and destination is at TX-HOU.

ASSISTANT: ok, let me know your airport codes? Sorry travelling dates?

USER: My planned dates of travel are from 09/26 to 09/28.

ASSISTANT: Ok, any other requirements?

USER: I need a direct flight. Budget limit is 500.

ASSISTANT: ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok ,no issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you.