You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to go for a Death Valley Adventure at Phoenix, can you book me a direct flight?

ASSISTANT: Sure, please share me your travelling dates?

USER: Ok, I would like to travel on 09/22 and return on 09/24.

ASSISTANT: OK, do you have any specifications?

USER: Yes, my price should be under 5000.

ASSISTANT: To book your ticket, we need your airport codes?

USER: Ok, I want to travel from TX-HOU to AZ-PHX.

ASSISTANT: OK, please wait for few minutes, let me check and revert you.

USER: Sure.

ASSISTANT: Sorry, to inform you that there is no flight with your requirement.

USER: Ok, no issue.

ASSISTANT: Can you please provide me your good name?

USER: Yes, you can call me as Jonathan Evans.

ASSISTANT: Thank you, for choosing us.

USER: Thank you for the response.