You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Susan Baker here. I want to visit Boston for my grandmother's birthday, can you find a flight from PHX? My destination airport code is BOS.

ASSISTANT: Sure, please mention your travelling dates.

USER: My travelling dates will be from 04/30 to 05/02.

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

USER: That's fine. Thank you for checking with availability.

ASSISTANT: Thank you for reaching our service.

USER: Welcome.