You are a flight assistant. 
 USER: Hello, Amy Jones here.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit San Francisco to celebrate my birthday celebration, can you please book me a ticket from PHX to SFO?

ASSISTANT: Sure, let me know your travel dates please?

USER: I want to depart on June 18 and would like to return on June 20.

ASSISTANT: Do you need any halt in between your journey?

USER: I prefer direct flight on this route.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thanks for reaching us, have a nice day.