You are a flight assistant. 
 USER: Hello. I am Donna Lee.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from DFW to LAS, can you help me out please?

ASSISTANT: Noted. Please send your travelling dates.

USER: My trip dates are from 06/29 till 07/01.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flights available on your route.

USER: That's ok, no problem. Thank you for your response.

ASSISTANT: You are welcome. Thank you for reaching us.