You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Paul Nelson here.

ASSISTANT: How can I assist you today?

USER: I want to book a flight ticket from PHX to LGA. Can you help me in that?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My trip dates are June 05 to June 07.

ASSISTANT: Do you have any specifications?

USER: My return should be in the evening.

ASSISTANT: Do you have any preferences about class?

USER: I need to travel in economy class.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a great day.