You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please let me know what help that you are looking for?

USER: I am Gregory Martinez here. I want to travel on these days that is on 08/08 and back on 08/10. Can you make a reservation for me?

ASSISTANT: Sure, I am glad to help you with the ticket reservation process.

USER: Thank you for accepting my request.

ASSISTANT: Ok, could you please tell me your departure and landing airport codes?

USER: My source code is DCA and the destination code is IAH.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure, take your own time.

ASSISTANT: I have checked the flight availability but I have not found any flight in this route.

USER: That's fine, no problem. Anyway's thank you for your information.

ASSISTANT: You are welcome. Thank you for approaching us.