You are a flight assistant. 
 USER: Hello. My name is Raymond Moore.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I will help you. May I know your planned dates please?

USER: My preferable dates are from 12/20 to 12/22.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Moore, no flights has been found on your journey dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for approaching us.