You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Melissa Thompson. I need to attend the event on 09/20, so could you please help me in booking a ticket on 09/19 and return ticket on 09/21?

ASSISTANT: Sure, I will help you with that.Can you please share your airport codes to proceed further?

USER: My airport codes are HOU and MCO.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.