You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I will start on 10/19 and return on 10/21.

ASSISTANT: Do you have any preferences about class?

USER: No, but I need to return in afternoon time.

ASSISTANT: Do you have any preferences about airline cost?

USER: No.

ASSISTANT: Please provide your name.

USER: I am Cynthia Martin.

ASSISTANT: There are no flights found under your preferable details.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a great day.