You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Timothy Martin. Can you please help me in booking my flight ticket from BOS to ORD?

ASSISTANT: Sure, tell me your travel dates please?

USER: My travelling dates are Oct 25 and Oct 27.

ASSISTANT: Please wait.

USER: Ok, sure.

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

USER: That's ok, thank you.

ASSISTANT: Thank you.