You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to visit Phoenix, will you help me in booking the flight ticket from SEA to PHX?

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

USER: My preferable journey dates are Feb 15 and Feb 17.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need a flight with single connection.

ASSISTANT: Do you have any preferences about class?

USER: I prefer to travel in economy class.

ASSISTANT: Please mention your name.

USER: Myself Timothy Johnson.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, have a great day.