You are a flight assistant. 
 USER: Hello,. I am Michelle Edwards.

ASSISTANT: Hello, how can I aid you today?

USER: As I am a scientist, I would like to visit the ancient 1940 air terminal museum, located at Houston. Can you book me a ticket within the range 500?

ASSISTANT: Ok, please provide your dates of journey?

USER: I want to travel on 06/24, and need to catch return flight on 06/26.

ASSISTANT: I need your airport codes of your source and destination points?

USER: I need to leave from my nearest airport SFO to reach HOU.

ASSISTANT: Sorry, no flights are available on your desired route. Thanks for consulting us, have a nice day.

USER: Ok, no issues. Thanks for the information.