You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Robert Johnson.

ASSISTANT: How may I help you?

USER: Will you help me in booking the flight ticket from PHX to IAD?

ASSISTANT: Can you please mention your travelling dates?

USER: My travelling dates are 07/31 and 08/02.

ASSISTANT: Sorry, there are no flight available on your route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.