You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: This is Angela Hernandez. I want to visit Houston, TX - IAH  to meet my relatives, please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are from 05/12 to 05/14.

ASSISTANT: Where do you leave from?

USER: I want to leave from NV- LAS.

ASSISTANT: Sorry there is no flight on your route.

USER: No problem, I will find my alternative.

ASSISTANT: Thank you.

USER: Thanks for your information.