You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Welcome to global booking agency.

USER: Donald Lee here.

ASSISTANT: Yes Lee, how may I help you?

USER: I am here to book a ticket for myself, Can you help me?

ASSISTANT: Sure Donald, can I have your travelling dates?

USER: My travelling dates are from 09/23 till 09/25.

ASSISTANT: Ok, could you provide me your airport codes?

USER: I am a native of Denver and nearest airport is DEN, My destination would be SFO.

ASSISTANT: Ok Lee, please wait for a minute.

USER: Please check the flight with single connection.

ASSISTANT: Ok. Yes Lee, I found a flight-1010 with UA airlines. Can I proceed for booking?

USER: Please proceed.

ASSISTANT: Yes Donald, your reservation is done.

USER: Thank you for the help.

ASSISTANT: Thank you for approaching us, have  a great journey.

USER: Welcome.