You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Collins.

ASSISTANT: How may I assist you?

USER: I heard there is an exhibition going on in SFO. So, I feel to go there for my relaxation. Can you book a ticket from HOU?

ASSISTANT: Sure Collins, I will help you for booking. May I know your travelling dates?

USER: My trip dates are from 05/31 to 06/02.

ASSISTANT: Sorry Collins, there is no flight available for you.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Welcome. Thank you for choosing us.

USER: You are welcome.