You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Lisa Rodriguez from Houston. Can you please help me in booking a flight ticket from IAH to SEA?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I want to fly on July 12 and return on July 14.

ASSISTANT: Sure, I will help you. Please send your travelling dates. Sorry, there is no flight available on your requested dates.