You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Steven Lopez here. I want to take a flight on 07/13 from ORD, hoping that you are helping me out.

ASSISTANT: Sure, can you please tell me your return journey details?

USER: Sure, I will be returning on 07/15 from HOU.

ASSISTANT: Sorry, there is no plane as per your requested travelling dates.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure.