You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Jackson.

ASSISTANT: How may I assist you now?

USER: In Phoenix, I have some urgent work. Can you please help me in ticket booking from Chicago?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are from 05/20 to 05/22.

ASSISTANT: Do you have any specifications?

USER: My ticket should be reserved in economy class.

ASSISTANT: Sorry, there is no flight available with economy class for this tip. Thank you for approaching our services.

USER: It's ok, thank you.

ASSISTANT: Have a nice day.