You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What service do you need from us?

USER: I am Donald Moore. I would like to book a ticket to Houston, can you please help me out?

ASSISTANT: Sure, I am here to help you. Will you please share your travel dates?

USER: I am travelling on these dates 07/13 and 07/15.

ASSISTANT: What airport codes do you prefer  to travel?

USER: I am flying from LAS to HOU.

ASSISTANT: Sorry to inform you, there is no flight found in this route.

USER: Ok no problem, thank you for your services.

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