You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Richard Clark, can you please help me in booking a flight ticket from PHX to EWR?

ASSISTANT: Sure, I will help you for booking. Can you please provide me your travelling dates?

USER: My trip dates are from 07/14 till 0/716.

ASSISTANT: Ok, give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flights is available on your route.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome.