You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amanda Harris here.

ASSISTANT: Harris, how can I help you?

USER: I am looking for a flight ticket on the route from IAD to DFW, can you please search for it?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable dates are from 06/14 to 06/16.

ASSISTANT: Ok, wait for a moment to check availability.

USER: Ok.

ASSISTANT: Sorry to say this, no flights as per your requirements.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.