You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you help me booking a flight t ticket from PHX to ORD?

ASSISTANT: Sure, may I know your name please?

USER: I am Brenda Lewis.

ASSISTANT: May I know your planned travelling dates please?

USER: I will start on 07/15 and return on 07/17.

ASSISTANT: May I know your class preference please?

USER: I am looking for economy class flight.

ASSISTANT: Sorry Lewis, there is no flight found as per your travelling dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.