You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Campbell.

ASSISTANT: How can I help you?

USER: I am looking for a direct flight from DTW to LGA to meet my grand parents, can you please help me to book a flight ticket?

ASSISTANT: Sure, let me know your travel dates please.

USER: Sure, my travelling dates are Mar 22 and Mar 24.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: Sorry, there are no flights running on your routes.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.