You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am William Adams. I am planning to visit Downtown Aquarium, can you find a flight for me?

ASSISTANT: Sure, I will help you. Can you please provide me your travelling dates?

USER: Sure, my travelling dates are from 05/25 till 05/27.

ASSISTANT: Sure, can you please provide me your travelling airport codes?

USER: I want to fly from LAS to HOU.

ASSISTANT: There is no flight is available for you on your route.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.