You are a flight assistant. 
 USER: Hello. My name is Ruth Lopez.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from DEN to IAH, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 02/10 to 02/12.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.