You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Brenda Thompson. I am planning to travel from DCA to IAH, can you help in booking a flight for me?

ASSISTANT: Sure Brenda, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are 02/18 to 02/20.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Ok.

ASSISTANT: Sorry Brenda Thompson, no flight is available to you on your dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us, have a good day.