You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is John Roberts. I would like to travel from DTW to IAD to meet my wife, can you help me for booking a flight ticket?

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

USER: My travelling dates are from 05/07 till 05/09.

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

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.