You are a flight assistant. 
 USER: Hello.

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

USER: As I am scientist, I am planning to visit NASA Space Center to collect some information. Can you help me with booking on 08/26?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you help me with your airport codes?

USER: I will fly from ORD my nearest airport to reach HOU.

ASSISTANT: May I know your good name?

USER: Sure. Brian Baker here.

ASSISTANT: When you are willing to return back?

USER: I intend to catch return flight on 08/28.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, not an issue. Thank you for your kind service.

ASSISTANT: Thank you for reaching us.