You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER:  I am Melissa Johnson. I want to book a ticket to Orlando,FL-MCO to attend my granddaughter birthday. Can you book a ticket on 03/09?

ASSISTANT: Sure, let me know your return date and origin point?

USER: I will return on 03/10. I will depart from CO-DEN.

ASSISTANT: Please hold on a minute.

USER: Ok.

ASSISTANT: Please re-check your travel dates.

USER: I will return on 03/11.

ASSISTANT: Okay. Sorry, there are no flights to your route.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching us.