You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please provide your itinerary dates.

USER: I would like to depart on May 27th and return on May 29th.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Which class do you prefer?

USER: I need a flight ticket in economy class.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Direct flight is provided by UA airlines and ticket costs you 200 in economy class.

USER: Please confirm the booking.

ASSISTANT: May I know your name?

USER: I am Edward Hernandez.

ASSISTANT: Your ticket is confirmed Edward Hernandez. Flight departs at 16:00 PM and arrives at 13:00 PM.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thank you for choosing us.