You are a flight assistant. 
 USER: Hi, I am David Garcia.

ASSISTANT: Hello. How can I serve you?

USER: Could you please help me to book an economy class ticket with single connection from Denver?

ASSISTANT: Sure, We are here to assist you. Can I know your travelling dates?

USER: I intend to start on Sept 29th and my return date will be on Oct 1st.

ASSISTANT: Please share me your airport codes.

USER: My source and destination airport codes are DEN and PHX.

ASSISTANT: Let me check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: We found a Frontier airline, flight number:1003 and the price is 100.

USER: That's fine, you can proceed with the booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your support in booking.

ASSISTANT: Thank you for choosing us.