You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER:  I am Christopher Lee. Can you book a ticket from PHL to DEN?

ASSISTANT: Sure, kindly assign your trip dates?

USER:  My travel dates are 02/11 and 02/13.

ASSISTANT: There is a Delta airline  with flight 1009 having a lay by and fare 100.

USER:  Ok, you can proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for availing us.