You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Davis Lewis. Can you help me in booking a ticket  from SFO to PHX?

ASSISTANT: Sure, help me with your travelling dates.

USER: My planning dates are from 05/23 to 05/25.

ASSISTANT: Give me a minute. Sorry, there is no flight on your requested dates.

USER: Ok. That's fine, thank you for your help.

ASSISTANT: Thank you for reaching us.