You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me in booking my flight ticket to Chicago?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates?

USER: My trip dates will be Nov 26th to Nov 28th.

ASSISTANT: May I know your airport codes?

USER: My airport codes will be DEN to ORD.

ASSISTANT: Do you have any other specifications?

USER: I prefer a flight which should depart in the afternoon.

ASSISTANT: Let me know your name?

USER: I am Sandra Edwards.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Its ok, thank you.

ASSISTANT: Thanks for approaching us.