You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Susan Martin here.

ASSISTANT: How may I guide you today?

USER: I would like to book a ticket from IAD to CLT, can you please help me with that?

ASSISTANT: Sure, I am oblige to assist you with that. Can you please provide your departure and return dates of travelling?

USER: The travel dates are from 07/23 to 07/25.

ASSISTANT: Please wait a moment to check the flights availability in your route.

USER: Ok.

ASSISTANT: Sorry, as per your requested information, there are no flights found. If you want to go some another dates, we will provide a flight for you.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for reaching to our services, have a great day.