You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: Please help me in booking a ticket with direct flight to attend an emergency surgery.

ASSISTANT: Ok. May I know your journey dates?

USER: My journey dates are from 08/28 to 08/30.

ASSISTANT: Kindly, mention your airport codes.

USER: Source code is Charlotte, CLT and destination code is Detroit, DTW.

ASSISTANT: We did not find direct flight.

USER: It's ok. Thank you.

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

USER: My name is Gary Carter.

ASSISTANT: Thank you.