You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Nicholas Campbell. I have a plan to meet my friend in Dallas. Can you help me for booking a flight ticket from LGA to DTW?

ASSISTANT: Sure, I am here to help you in booking. Can I have your travel dates please?

USER: My travelling dates are 09/17 and 09/19.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no flights are available on your journey dates.

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

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.