You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Patricia King. I have a plan to meet my friend in Dallas, can you help me for booking a flight ticket?

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

USER: My travelling dates are from 04/10 till 04/12.

ASSISTANT: Ok, may I know your airport codes?

USER: My travelling airport codes are from DTW to DFW.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome.