You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need a flight of price 5000 to visit Dallas to see my grand children.

ASSISTANT: Sure, can I have your name please?

USER: Sure, Angela Collins.

ASSISTANT: Ok, could you help me with your journey dates?

USER: I am returning from Dallas on 07/24 and travel from Phoenix on 07/22.

ASSISTANT: Ok, may I know your airport codes please?

USER: Airport code of source is PHX and destination code is DFW.

ASSISTANT: Ok, hold on I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say you that we have not found any flights on your requested dates.

USER: Ok, thanks for the information.

ASSISTANT: Ok, thanks for choosing us.