You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kevin Parker here.

ASSISTANT: How can I assist you at this time Kevin?

USER: I want to go Phoenix, to meet my childhood friend there, so could you please help me with booking of a flight?

ASSISTANT: That's fine Parker, can I know your requested airport codes for source and destination regions?

USER: Sure, I want to travel from IAH to PHX.

ASSISTANT: Can I have your probable travelling dates?

USER: I want to takeoff from Houston on 09/21 and please book a return flight also on 09/23.

ASSISTANT: Please wait I will search for flights and revert you back is there any flights available.

USER: Sure, I will wait for your response.

ASSISTANT: On of the flight 1025 is available in Delta airlines and they are more interested in to take more people for their income so there is 1 drop in your journey. Shall I block your reservation?

USER: Sure, please book this flight for me.

ASSISTANT: Your seat is confirmed Kevin, you can enjoy your trip with your friend.

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

ASSISTANT: You are most welcome.