You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book me a ticket from SEA to SFO to meet my family.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: I have planned to travel on May 01st and return on May 03rd.

ASSISTANT: Ok, may I know your name?

USER: Myself Emily Davis.

ASSISTANT: Do you have any specification?

USER: I want depart at afternoon time.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.