You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Garcia.

ASSISTANT: Garcia, how can I help you today?

USER: I am planning to visit Museum of Nature and Science at Houston, could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you with booking, please share your travelling dates?

USER: I would like to take off on 12/12 and return on 12/14.

ASSISTANT: May I know your airport codes to proceed further?

USER: My nearest source airport code is IAD and destination airport code is DEN.

ASSISTANT: There is a flight in Delta airline with connection 1.

USER: I am looking for a direct flight.

ASSISTANT: Sorry, no direct flights.

USER: That's ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.