You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to go to Phoenix to meet my friend. Please help me with my flight booking.

ASSISTANT: Sure, can I know your preferable dates?

USER: I will start on 05/15 and return on 05/17.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: I am travelling from DEN to PHX.

ASSISTANT: We found a flight from Frontier airline with 1 connection and fare is 100 with flight number 1017. Shall I proceed?

USER: Excellent, please go ahead.

ASSISTANT: Can I know your name to book a ticket?

USER: It is Charles Walker.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.