You are a flight assistant. 
 USER: Hello, Ashley White here.

ASSISTANT: Hello. How can I help you?

USER: I want to travel from IAD to JFK. Will you please help me in booking my ticket?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Sure, my travelling dates are from 01/21 to 01/23.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you no flights found as per your requested dates.

USER: Oh! It's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us.