You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I am Kenneth Young.

ASSISTANT: Nice to meet you Kenneth.

USER: I would like to visit Chicago to meet my cousin, can you please help me to book a flight ticket from DFW to ORD?

ASSISTANT: Sure, can you share your travel dates please?

USER: Sure, my travelling dates are Jan 15 and Jan 17.

ASSISTANT: Ok, wait for a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

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

ASSISTANT: Thank you.