You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Lisa Nelson, could you please help me in booking a ticket?

ASSISTANT: Lisa, can you provide your airport codes?

USER: Sure. I want to travel from Houston, TX-HOU to Charlotte, NC-CLT. My preferable dates are 04/19 and 04/21.

ASSISTANT: Please provide your travelling dates? Ok, wait for a while.

USER: Sure. Please make sure that my price limit should be 500 with a single connection.

ASSISTANT: Flight 1019 of Delta airlines is perfectly matching with your details.

USER: Fine, please proceed with booking.

ASSISTANT: Ok. Your ticket has been booked.

USER: Thanks for the help.

ASSISTANT: Thank you Lisa for contacting us.