You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Emily Hernandez. I would like to travel from PHX to SFO, could you help me out?

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

USER: My preferable dates are from 05/14 to 05/16.

ASSISTANT: Please give me a moment.

USER: Ok.

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

USER: That's ok. Thank you for your time.

ASSISTANT: Welcome, have a great day.