You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Christopher Martinez.

ASSISTANT: Yes Christopher.

USER: Can you help me to book a flight from DTW on 12/18?

ASSISTANT: Sure, I will help you in booking, please share your destination airport code and return date also?

USER: I would like to return from DCA on 12/20.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flights with your requirements.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.