You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Gregory Mitchell here.

ASSISTANT: How can I help you today?

USER: I want to book a flight reservation on the route from LAX - HOU to meet an old friend, can you hep me?

ASSISTANT: Sure, please tell me your planned trip dates.

USER: My journey dates will be from 03/30 to 04/01.

ASSISTANT: Ok, please give me sometime.

USER: Ok.

ASSISTANT: Sorry Mitchell, no flight is available on your route.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.