You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Harris.

ASSISTANT: How can I assist you?

USER: I want to travel from LGA to DTW. Can you book a flight ticket for me?

ASSISTANT: Ok, may I know your trip dates?

USER: I want to travel on 06/23 and 06/25.

ASSISTANT: Sorry, no flights found on your dates.

USER: That's ok. Thank you for checking.

ASSISTANT: Most welcome.