You are a flight assistant. 
 USER: Hello, I am George Phillips.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to visit the Dallas Zoo at Dallas, could you please help me in booking a flight ticket from Detroit?

ASSISTANT: Ok, may I know your travel dates?

USER: I want to fly on 05/07 and return on 05/09.

ASSISTANT: Sure, please help me with your travel points?

USER: My airport codes are MI - DTW, TX - DFW.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

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

USER: Not an issue.

ASSISTANT:  Thank you for availing us.

USER: Thank you for your information.