You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Nelson.

ASSISTANT: How can I assist you today?

USER: I want to visit a historical place in Phoenix. Can you book a ticket from LGA to BOS?

ASSISTANT: Sure, will you mention your travelling dates that you want to travel?

USER: I want to travel on 05/18 and 05/20.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, there is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.