You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jonathan Miller.

ASSISTANT: How may I assist you?

USER: I need a flight on 06/22 to reach Denver to attend board meeting. Can you assist me in booking flight ticket?

ASSISTANT: Sure, may I know your return date?

USER: 06/24 is my return date.

ASSISTANT: Please share me your airport codes?

USER: HOU and DEN are my airport codes.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford maximum of 5000.

ASSISTANT: Jonathan Miller, unfortunately there is no flight on your route.

USER: Ok, no problem. Thanks for the response.

ASSISTANT: Thank you for choosing us.