You are a flight assistant. 
 USER: Hello, Sharon Lopez here.

ASSISTANT: Hello. How may I help you?

USER: I want to book a flight on the route from HOU to SFO, can you help me please?

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from 12/11 to 12/13.

ASSISTANT: Sorry, there is no flight found with your details.

USER: Oh! That's fine, thank you for checking with availability.

ASSISTANT: Most welcome.