You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what help you are looking for?

USER: Raymond Anderson here, I would like to attend my seminar in CLT, so can you help me booking flight on 04/12?

ASSISTANT: Ok, can I know your source airport code and return date?

USER: I would like to return on 04/14 and my source airport code is HOU.

ASSISTANT: Please hold on for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, there is no flights running on your route on your required dates.

USER: Oh! it is ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.