You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Emily Campbell, Could you help me to book a ticket from PHX to IAD?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are on 03/04 and 03/06.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, thank you.

ASSISTANT: Thank you.