You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to visit Heard Museum in Phoenix, AZ - PHX. Can you please hold me a flight ticket from Denver, CO - DEN?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travel dates are 06/07 - 06/09.

ASSISTANT: May I know your good name?

USER: I am Carol Thompson.

ASSISTANT: How much can you afford for the ticket?

USER: I can afford up to 500 only.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.