You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please book a ticket on 11/19 and return on 11/21 to Detroit?

ASSISTANT: Sure, I am here to assist you. How much can you afford for a ticket?

USER: I can afford upto 200.

ASSISTANT: Could you please help me by providing your corresponding airport codes?

USER: CLT and DTW are my airport codes.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: My name is Christopher Thomas.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT:  Thanks for your precious time. We found UA airline fare of 100. Shall I proceed for booking with single stop over flight?

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed with airline number 1025.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.