You are a flight assistant. 
 USER: Hi, I am Amanda Jackson.

ASSISTANT: Hello. How may I help you?

USER: Please reserve me a ticket from Washington, DC-DCA to reach Houston, TX-IAH.

ASSISTANT: Ok, can you please share your trip dates too.

USER: My trip dates are from 08/30 to 09/01.

ASSISTANT: Sorry, there is no flight for you on your preferable dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome Amanda Jackson.