You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ashley Lopez here.

ASSISTANT: Lopez, how can I serve you now?

USER: I need a direct flight to visit Washington for my visit to white house. Can you book it?

ASSISTANT: Ok, please let me know your airport codes.

USER: My airport codes for boarding the fight are IAH to IAD.

ASSISTANT: On which dates do you want to travel?

USER: I am giving you my journey dates that is from 05/08 to 05/10.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry Lopez, no flight is available on your route as per your requirements.

USER: Ok, I will check with other airline. Thank you.

ASSISTANT: Thank you for consulting us.