You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Helen Parker, I want to book a flight ticket to meet my uncle at EWR, can you help me with booking?

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Jan 05 and Jan 07.

ASSISTANT: Do you have any preference?

USER: My return time is afternoon.

ASSISTANT: Can I know your boarding airport code?

USER: My boarding point is DFW.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.