You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Robinson.

ASSISTANT: How can I assist you today?

USER: I want to travel from ORD to MSP. Can you book a flight ticket for me?

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

USER: I want to travel in the flight in May on 16 and 18.

ASSISTANT: How much you can afford for your journey?

USER: My budget for ticket is 500.

ASSISTANT: Do you have any class preferences?

USER: No, but I want to depart in afternoon time.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Welcome, have a great day.