You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from HOU to LAX to meet my grandparents.

ASSISTANT: That's great. May I know your travelling dates?

USER: My travel dates are 12/06 to 12/08.

ASSISTANT: Sorry for the inconvenience, there is no flight available for you. May I know your good name please?

USER: That's fine, thanks for your information. My name is John Nelson.

ASSISTANT: Thank you for reaching us.