You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Dennis Mitchell.

ASSISTANT: Ok.

USER:  I want to book a flight to Denver to bring back my certificates from my university, can you help me in my booking?

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are from 11/13 to 11/15.

ASSISTANT: Please share me your nearest airport codes.

USER: My journey airport codes are from IAH to DEN.

ASSISTANT: We found a  Delta airline, flight number:1000 and the price is 100.

USER: Proceed with my booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.