You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Susan Mitchell here.

ASSISTANT: How can I aid you?

USER: I would like to attend a business meeting in Chicago, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, may I know your nearest airport codes please?

USER: I will prefer PHL as my origin airport code and ORD as my destination airport code.

ASSISTANT: May I know your journey dates please?

USER: Sure, I am planning to leave on 06/23 and please book my return ticket on 06/25.

ASSISTANT: Wait for a while please.

USER: Ok, I will wait for your response.

ASSISTANT: Susan Mitchell, there are no flights with your preferences.

USER: Oh! Sad to hear that. Anyway, I will choose another alternative to complete my journey. Thank you.

ASSISTANT: Thank you for approaching us.

USER: Welcome.