You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Betty Taylor. I would like to book a flight ticket from HOU to SFO, can you please do it for me?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my planned travelling dates are from 03/03 to 03/05.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.