You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Debra Lopez.

ASSISTANT: How can I aid you now?

USER: Can you help me in booking my flight ticket to DTW from JFK to celebrate the birthday of my sister?

ASSISTANT: Sure, provide me your travel dates please.

USER: Sure, my travel dates are May 27 and May 29.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight for my journey.

ASSISTANT: May I know about your class preference?

USER: I am comfortable with any of the class.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable with any of the airline.

ASSISTANT: Let me know your arrival and departure timings.

USER: I need to departure in the evening and I do not have any such preference at the time of arrival.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

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

USER: Not a problem, I will go with another resources to complete my trip. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us.