You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I want to go to Charlotte to attend a science exhibition. Could you please assist me in ticket booking?

ASSISTANT: Sure, we are glad to assist you. May I know your travelling dates please?

USER: My travelling dates are from 01/27 to 01/29.

ASSISTANT: Can you please help me with your airport codes?

USER: HOU and CLT are my source and destination points.

ASSISTANT: How much you can afford for ticket fare?

USER: I can afford upto 500.

ASSISTANT: Thank you for your details, please hold a moment. let me search a flight for you.

USER: Ok.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: It's ok. Thank you.

ASSISTANT: For documentation purpose, may I know your name please?

USER: Timothy Martin is my name.

ASSISTANT: Thank you for reaching us.

USER: Thank you.