You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any assistance from us?

USER: I am Carolyn Garcia, can you help me to book a flight ticket from PHX to BOS?

ASSISTANT: Sure, may I know on what dates you need booking?

USER: Ok, I will start my journey on 11/15 and return on 11/17.

ASSISTANT: Sorry Garcia, there is no flight on your requested travelling dates.

USER: Thank you for the information. I will try next time.

ASSISTANT: You are welcome.