You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Hall.

ASSISTANT: How may I assist you today?

USER: I need to book a flight ticket from MCO to IAD, Can you please help me for booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to travel on 08/22 to return on 08/24.

ASSISTANT: Is there any particular timings in your departure and arrival?

USER: Yes, I would be depart on morning.

ASSISTANT: Please wait a moment.

USER: Sure,.

ASSISTANT:  Sorry, there are no flight tickets available on your journey dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching our service.

USER: Thanks for your information.