You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Robert Campbell, please reserve my ticket from BOS to DTW?

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

USER: My trip dates are 07/21 and 07/23.

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

USER: Ok, please proceed. Thank you for your help.

ASSISTANT: Welcome.