You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I support you?

USER: Cynthia Collins here. I want to book a flight ticket from LAS to IAH. Could you help me?

ASSISTANT: Sure, let me know your planned travel dates please?

USER: My preferable dates are from 05/26 to 05/28.

ASSISTANT: Thanks for your details, no flights found with your given details.

USER: That's ok. Thank you for helping me.

ASSISTANT: Thanks for availing us.