You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Colins.

ASSISTANT: May I know, what kind of service you are expecting from our side?

USER: I want to book a flight ticket from GA-ATL to AZ-PHX. Can you help me?

ASSISTANT: Sure, can you mention your preferable travelling dates?

USER: 09/21 and 09/23 are my travelling dates.

ASSISTANT: Ok, Is there any price restriction?

USER: 500 is my fare.

ASSISTANT: Sorry Joshua Collins, there are no flights found on your travel dates.

USER: No issue. Thank you.

ASSISTANT: Thanks for your presence.