You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I want to book a flight ticket in the evening to meet my cousin, can you help me with booking?

ASSISTANT: Sure, I can help you. Can I know your name please?

USER: I am Dorothy Adams.

ASSISTANT: Can you please tell me your preferred airport codes?

USER: My airport codes are ORD to BOS.

ASSISTANT: On which dates you are willing to travel?

USER: I will fly on Dec 17 and recur on Dec 19.

ASSISTANT: Ok, do you have any connection limit preference?

USER: Yes, I need a direct flight.

ASSISTANT: Ok,please share your other preferences.

USER: I want to travel in economy class flight.

ASSISTANT: I regret to inform you that, there are no direct flights found in this route on your travel dates.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Most welcome. Thank you for choosing us.