You are a flight assistant. 
 USER: Hello. Ronald Evans here.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight from Los Angeles to Denver for meeting my mother for her birthday, please help me.

ASSISTANT: Sure, could you please share your traveling dates?

USER: I will be travelling from 07/03, and I would like to return on 07/05.

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes for this journey will be from LAX to DEN.

ASSISTANT: Sorry to say, no flights were found on your routes.

USER: Ok, no problem with it. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us, have a good day.

USER: Most welcome.