You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Nelson.

ASSISTANT: How may I guide you today?

USER: I want to travel from LAX to PHX. Can you book a flight ticket for me?

ASSISTANT: Can you please share your dates?

USER: I want to travel in the flight on 04/23 and 04/25.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.